3 * Copyright (c) 2001 Lutz Mueller <lutz@users.sourceforge.net>
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2 of the License, or (at your option) any later version.
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the
17 * Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
18 * Boston, MA 02110-1301 USA.
23 #include <libexif/exif-tag.h>
24 #include <libexif/i18n.h>
29 #define ESL_NNNN { EXIF_SUPPORT_LEVEL_NOT_RECORDED, EXIF_SUPPORT_LEVEL_NOT_RECORDED, EXIF_SUPPORT_LEVEL_NOT_RECORDED, EXIF_SUPPORT_LEVEL_NOT_RECORDED }
30 #define ESL_OOOO { EXIF_SUPPORT_LEVEL_OPTIONAL, EXIF_SUPPORT_LEVEL_OPTIONAL, EXIF_SUPPORT_LEVEL_OPTIONAL, EXIF_SUPPORT_LEVEL_OPTIONAL }
31 #define ESL_MMMN { EXIF_SUPPORT_LEVEL_MANDATORY, EXIF_SUPPORT_LEVEL_MANDATORY, EXIF_SUPPORT_LEVEL_MANDATORY, EXIF_SUPPORT_LEVEL_NOT_RECORDED }
32 #define ESL_MMMM { EXIF_SUPPORT_LEVEL_MANDATORY, EXIF_SUPPORT_LEVEL_MANDATORY, EXIF_SUPPORT_LEVEL_MANDATORY, EXIF_SUPPORT_LEVEL_MANDATORY }
33 #define ESL_OMON { EXIF_SUPPORT_LEVEL_OPTIONAL, EXIF_SUPPORT_LEVEL_MANDATORY, EXIF_SUPPORT_LEVEL_OPTIONAL, EXIF_SUPPORT_LEVEL_NOT_RECORDED }
34 #define ESL_NNOO { EXIF_SUPPORT_LEVEL_NOT_RECORDED, EXIF_SUPPORT_LEVEL_NOT_RECORDED, EXIF_SUPPORT_LEVEL_OPTIONAL, EXIF_SUPPORT_LEVEL_OPTIONAL }
35 #define ESL_NNMN { EXIF_SUPPORT_LEVEL_NOT_RECORDED, EXIF_SUPPORT_LEVEL_NOT_RECORDED, EXIF_SUPPORT_LEVEL_MANDATORY, EXIF_SUPPORT_LEVEL_NOT_RECORDED }
36 #define ESL_NNMM { EXIF_SUPPORT_LEVEL_NOT_RECORDED, EXIF_SUPPORT_LEVEL_NOT_RECORDED, EXIF_SUPPORT_LEVEL_MANDATORY, EXIF_SUPPORT_LEVEL_MANDATORY }
37 #define ESL_NNNM { EXIF_SUPPORT_LEVEL_NOT_RECORDED, EXIF_SUPPORT_LEVEL_NOT_RECORDED, EXIF_SUPPORT_LEVEL_NOT_RECORDED, EXIF_SUPPORT_LEVEL_MANDATORY }
38 #define ESL_NNNO { EXIF_SUPPORT_LEVEL_NOT_RECORDED, EXIF_SUPPORT_LEVEL_NOT_RECORDED, EXIF_SUPPORT_LEVEL_NOT_RECORDED, EXIF_SUPPORT_LEVEL_OPTIONAL }
39 #define ESL_UUUU { EXIF_SUPPORT_LEVEL_UNKNOWN, EXIF_SUPPORT_LEVEL_UNKNOWN, EXIF_SUPPORT_LEVEL_UNKNOWN, EXIF_SUPPORT_LEVEL_UNKNOWN }
40 #define ESL_GPS { ESL_NNNN, ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN }
41 #define ESL_UNKNOWN { ESL_UUUU, ESL_UUUU, ESL_UUUU, ESL_UUUU, ESL_UUUU }
44 * Table giving information about each EXIF tag.
45 * There may be more than one entry with the same tag value because some tags
46 * have different meanings depending on the IFD in which they appear.
47 * When there are such duplicate entries, there must be no overlap in their
49 * The entries MUST be sorted in tag order.
50 * The name and title are mandatory, but the description may be an empty
51 * string. None of the entries may be NULL except the final array terminator.
53 static const struct TagEntry {
54 /*! Tag ID. There may be duplicate tags when the same number is used for
55 * different meanings in different IFDs. */
59 const char *description;
60 /*! indexed by the types [ExifIfd][ExifDataType] */
61 ExifSupportLevel esl[EXIF_IFD_COUNT][EXIF_DATA_TYPE_COUNT];
63 #ifndef NO_VERBOSE_TAG_STRINGS
64 {EXIF_TAG_GPS_VERSION_ID, "GPSVersionID", N_("GPS Tag Version"),
65 N_("Indicates the version of <GPSInfoIFD>. The version is given "
66 "as 2.0.0.0. This tag is mandatory when <GPSInfo> tag is "
67 "present. (Note: The <GPSVersionID> tag is given in bytes, "
68 "unlike the <ExifVersion> tag. When the version is "
69 "2.0.0.0, the tag value is 02000000.H)."), ESL_GPS},
70 {EXIF_TAG_INTEROPERABILITY_INDEX, "InteroperabilityIndex",
71 N_("Interoperability Index"),
72 N_("Indicates the identification of the Interoperability rule. "
73 "Use \"R98\" for stating ExifR98 Rules. Four bytes used "
74 "including the termination code (NULL). see the separate "
75 "volume of Recommended Exif Interoperability Rules (ExifR98) "
76 "for other tags used for ExifR98."),
77 { ESL_NNNN, ESL_NNNN, ESL_NNNN, ESL_NNNN, ESL_OOOO } },
78 {EXIF_TAG_GPS_LATITUDE_REF, "GPSLatitudeRef", N_("North or South Latitude"),
79 N_("Indicates whether the latitude is north or south latitude. The "
80 "ASCII value 'N' indicates north latitude, and 'S' is south "
81 "latitude."), ESL_GPS},
82 {EXIF_TAG_INTEROPERABILITY_VERSION, "InteroperabilityVersion",
83 N_("Interoperability Version"), "",
84 { ESL_NNNN, ESL_NNNN, ESL_NNNN, ESL_NNNN, ESL_OOOO } },
85 {EXIF_TAG_GPS_LATITUDE, "GPSLatitude", N_("Latitude"),
86 N_("Indicates the latitude. The latitude is expressed as three "
87 "RATIONAL values giving the degrees, minutes, and seconds, "
88 "respectively. When degrees, minutes and seconds are expressed, "
89 "the format is dd/1,mm/1,ss/1. When degrees and minutes are used "
90 "and, for example, fractions of minutes are given up to two "
91 "decimal places, the format is dd/1,mmmm/100,0/1."),
93 {EXIF_TAG_GPS_LONGITUDE_REF, "GPSLongitudeRef", N_("East or West Longitude"),
94 N_("Indicates whether the longitude is east or west longitude. "
95 "ASCII 'E' indicates east longitude, and 'W' is west "
96 "longitude."), ESL_GPS},
97 {EXIF_TAG_GPS_LONGITUDE, "GPSLongitude", N_("Longitude"),
98 N_("Indicates the longitude. The longitude is expressed as three "
99 "RATIONAL values giving the degrees, minutes, and seconds, "
100 "respectively. When degrees, minutes and seconds are expressed, "
101 "the format is ddd/1,mm/1,ss/1. When degrees and minutes are "
102 "used and, for example, fractions of minutes are given up to "
103 "two decimal places, the format is ddd/1,mmmm/100,0/1."),
105 {EXIF_TAG_GPS_ALTITUDE_REF, "GPSAltitudeRef", N_("Altitude Reference"),
106 N_("Indicates the altitude used as the reference altitude. If the "
107 "reference is sea level and the altitude is above sea level, 0 "
108 "is given. If the altitude is below sea level, a value of 1 is given "
109 "and the altitude is indicated as an absolute value in the "
110 "GPSAltitude tag. The reference unit is meters. Note that this tag "
111 "is BYTE type, unlike other reference tags."), ESL_GPS},
112 {EXIF_TAG_GPS_ALTITUDE, "GPSAltitude", N_("Altitude"),
113 N_("Indicates the altitude based on the reference in GPSAltitudeRef. "
114 "Altitude is expressed as one RATIONAL value. The reference unit "
115 "is meters."), ESL_GPS},
116 {EXIF_TAG_GPS_TIME_STAMP, "GPSTimeStamp", N_("GPS Time (Atomic Clock)"),
117 N_("Indicates the time as UTC (Coordinated Universal Time). "
118 "TimeStamp is expressed as three RATIONAL values giving "
119 "the hour, minute, and second."), ESL_GPS},
120 {EXIF_TAG_GPS_SATELLITES, "GPSSatellites", N_("GPS Satellites"),
121 N_("Indicates the GPS satellites used for measurements. This "
122 "tag can be used to describe the number of satellites, their ID "
123 "number, angle of elevation, azimuth, SNR and other information "
124 "in ASCII notation. The format is not specified. If the GPS "
125 "receiver is incapable of taking measurements, value of the tag "
126 "shall be set to NULL."), ESL_GPS},
127 {EXIF_TAG_GPS_STATUS, "GPSStatus", N_("GPS Receiver Status"),
128 N_("Indicates the status of the GPS receiver when the image is "
129 "recorded. 'A' means measurement is in progress, and 'V' means "
130 "the measurement is Interoperability."), ESL_GPS},
131 {EXIF_TAG_GPS_MEASURE_MODE, "GPSMeasureMode", N_("GPS Measurement Mode"),
132 N_("Indicates the GPS measurement mode. '2' means "
133 "two-dimensional measurement and '3' means three-dimensional "
134 "measurement is in progress."), ESL_GPS},
135 {EXIF_TAG_GPS_DOP, "GPSDOP", N_("Measurement Precision"),
136 N_("Indicates the GPS DOP (data degree of precision). An HDOP "
137 "value is written during two-dimensional measurement, and PDOP "
138 "during three-dimensional measurement."), ESL_GPS},
139 {EXIF_TAG_GPS_SPEED_REF, "GPSSpeedRef", N_("Speed Unit"),
140 N_("Indicates the unit used to express the GPS receiver speed "
141 "of movement. 'K', 'M' and 'N' represent kilometers per hour, "
142 "miles per hour, and knots."), ESL_GPS},
143 {EXIF_TAG_GPS_SPEED, "GPSSpeed", N_("Speed of GPS Receiver"),
144 N_("Indicates the speed of GPS receiver movement."), ESL_GPS},
145 {EXIF_TAG_GPS_TRACK_REF, "GPSTrackRef", N_("Reference for direction of movement"),
146 N_("Indicates the reference for giving the direction of GPS "
147 "receiver movement. 'T' denotes true direction and 'M' is "
148 "magnetic direction."), ESL_GPS},
149 {EXIF_TAG_GPS_TRACK, "GPSTrack", N_("Direction of Movement"),
150 N_("Indicates the direction of GPS receiver movement. The range "
151 "of values is from 0.00 to 359.99."), ESL_GPS},
152 {EXIF_TAG_GPS_IMG_DIRECTION_REF, "GPSImgDirectionRef", N_("GPS Image Direction Reference"),
153 N_("Indicates the reference for giving the direction of the image when it is captured. "
154 "'T' denotes true direction and 'M' is magnetic direction."), ESL_GPS},
155 {EXIF_TAG_GPS_IMG_DIRECTION, "GPSImgDirection", N_("GPS Image Direction"),
156 N_("Indicates the direction of the image when it was captured. The range of values is "
157 "from 0.00 to 359.99."), ESL_GPS},
158 {EXIF_TAG_GPS_MAP_DATUM, "GPSMapDatum", N_("Geodetic Survey Data Used"),
159 N_("Indicates the geodetic survey data used by the GPS "
160 "receiver. If the survey data is restricted to Japan, the value "
161 "of this tag is 'TOKYO' or 'WGS-84'. If a GPS Info tag is "
162 "recorded, it is strongly recommended that this tag be recorded."), ESL_GPS},
163 {EXIF_TAG_GPS_DEST_LATITUDE_REF, "GPSDestLatitudeRef", N_("Reference For Latitude of Destination"),
164 N_("Indicates whether the latitude of the destination point is "
165 "north or south latitude. The ASCII value 'N' indicates north "
166 "latitude, and 'S' is south latitude."), ESL_GPS},
167 {EXIF_TAG_GPS_DEST_LATITUDE, "GPSDestLatitude", N_("Latitude of Destination"),
168 N_("Indicates the latitude of the destination point. The "
169 "latitude is expressed as three RATIONAL values giving the "
170 "degrees, minutes, and seconds, respectively. If latitude is "
171 "expressed as degrees, minutes and seconds, a typical format "
172 "would be dd/1,mm/1,ss/1. When degrees and minutes are used and, "
173 "for example, fractions of minutes are given up to two decimal "
174 "places, the format would be dd/1,mmmm/100,0/1."), ESL_GPS},
175 {EXIF_TAG_GPS_DEST_LONGITUDE_REF, "GPSDestLongitudeRef", N_("Reference for Longitude of Destination"),
176 N_("Indicates whether the longitude of the destination point is "
177 "east or west longitude. ASCII 'E' indicates east longitude, and "
178 "'W' is west longitude."), ESL_GPS},
179 {EXIF_TAG_GPS_DEST_LONGITUDE, "GPSDestLongitude", N_("Longitude of Destination"),
180 N_("Indicates the longitude of the destination point. The "
181 "longitude is expressed as three RATIONAL values giving the "
182 "degrees, minutes, and seconds, respectively. If longitude is "
183 "expressed as degrees, minutes and seconds, a typical format "
184 "would be ddd/1,mm/1,ss/1. When degrees and minutes are used "
185 "and, for example, fractions of minutes are given up to two "
186 "decimal places, the format would be ddd/1,mmmm/100,0/1."),
188 {EXIF_TAG_GPS_DEST_BEARING_REF, "GPSDestBearingRef", N_("Reference for Bearing of Destination"),
189 N_("Indicates the reference used for giving the bearing to "
190 "the destination point. 'T' denotes true direction and 'M' is "
191 "magnetic direction."), ESL_GPS},
192 {EXIF_TAG_GPS_DEST_BEARING, "GPSDestBearing", N_("Bearing of Destination"),
193 N_("Indicates the bearing to the destination point. The range "
194 "of values is from 0.00 to 359.99."), ESL_GPS},
195 {EXIF_TAG_GPS_DEST_DISTANCE_REF, "GPSDestDistanceRef", N_("Reference for Distance to Destination"),
196 N_("Indicates the unit used to express the distance to the "
197 "destination point. 'K', 'M' and 'N' represent kilometers, miles "
198 "and nautical miles."), ESL_GPS},
199 {EXIF_TAG_GPS_DEST_DISTANCE, "GPSDestDistance", N_("Distance to Destination"),
200 N_("Indicates the distance to the destination point."), ESL_GPS},
201 {EXIF_TAG_GPS_PROCESSING_METHOD, "GPSProcessingMethod", N_("Name of GPS Processing Method"),
202 N_("A character string recording the name of the method used "
203 "for location finding. The first byte indicates the character "
204 "code used, and this is followed by the name "
205 "of the method. Since the Type is not ASCII, NULL termination is "
206 "not necessary."), ESL_GPS},
207 {EXIF_TAG_GPS_AREA_INFORMATION, "GPSAreaInformation", N_("Name of GPS Area"),
208 N_("A character string recording the name of the GPS area. The "
209 "first byte indicates the character code used, "
210 "and this is followed by the name of the GPS area. Since "
211 "the Type is not ASCII, NULL termination is not necessary."), ESL_GPS},
212 {EXIF_TAG_GPS_DATE_STAMP, "GPSDateStamp", N_("GPS Date"),
213 N_("A character string recording date and time information "
214 "relative to UTC (Coordinated Universal Time). The format is "
215 "\"YYYY:MM:DD\". The length of the string is 11 bytes including "
217 {EXIF_TAG_GPS_DIFFERENTIAL, "GPSDifferential", N_("GPS Differential Correction"),
218 N_("Indicates whether differential correction is applied to the "
219 "GPS receiver."), ESL_GPS},
220 /* Not in EXIF 2.2 */
221 {EXIF_TAG_NEW_SUBFILE_TYPE, "NewSubfileType",
222 N_("New Subfile Type"), N_("A general indication of the kind of data "
223 "contained in this subfile."),
225 {EXIF_TAG_IMAGE_WIDTH, "ImageWidth", N_("Image Width"),
226 N_("The number of columns of image data, equal to the number of "
227 "pixels per row. In JPEG compressed data a JPEG marker is "
228 "used instead of this tag."),
229 { ESL_MMMN, ESL_MMMN, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
230 {EXIF_TAG_IMAGE_LENGTH, "ImageLength", N_("Image Length"),
231 N_("The number of rows of image data. In JPEG compressed data a "
232 "JPEG marker is used instead of this tag."),
233 { ESL_MMMN, ESL_MMMN, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
234 {EXIF_TAG_BITS_PER_SAMPLE, "BitsPerSample", N_("Bits per Sample"),
235 N_("The number of bits per image component. In this standard each "
236 "component of the image is 8 bits, so the value for this "
237 "tag is 8. See also <SamplesPerPixel>. In JPEG compressed data "
238 "a JPEG marker is used instead of this tag."),
239 { ESL_MMMN, ESL_MMMN, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
240 {EXIF_TAG_COMPRESSION, "Compression", N_("Compression"),
241 N_("The compression scheme used for the image data. When a "
242 "primary image is JPEG compressed, this designation is "
243 "not necessary and is omitted. When thumbnails use JPEG "
244 "compression, this tag value is set to 6."),
245 { ESL_MMMN, ESL_MMMM, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
246 {EXIF_TAG_PHOTOMETRIC_INTERPRETATION, "PhotometricInterpretation",
247 N_("Photometric Interpretation"),
248 N_("The pixel composition. In JPEG compressed data a JPEG "
249 "marker is used instead of this tag."),
250 { ESL_MMMN, ESL_MMMN, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
251 /* Not in EXIF 2.2 */
252 {EXIF_TAG_FILL_ORDER, "FillOrder", N_("Fill Order"), "", ESL_UNKNOWN},
253 /* Not in EXIF 2.2 */
254 {EXIF_TAG_DOCUMENT_NAME, "DocumentName", N_("Document Name"), "",
256 {EXIF_TAG_IMAGE_DESCRIPTION, "ImageDescription",
257 N_("Image Description"),
258 N_("A character string giving the title of the image. It may be "
259 "a comment such as \"1988 company picnic\" or "
260 "the like. Two-bytes character codes cannot be used. "
261 "When a 2-bytes code is necessary, the Exif Private tag "
262 "<UserComment> is to be used."),
263 { ESL_OOOO, ESL_OOOO, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
264 {EXIF_TAG_MAKE, "Make", N_("Manufacturer"),
265 N_("The manufacturer of the recording "
266 "equipment. This is the manufacturer of the DSC, scanner, "
267 "video digitizer or other equipment that generated the "
268 "image. When the field is left blank, it is treated as "
270 { ESL_OOOO, ESL_OOOO, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
271 {EXIF_TAG_MODEL, "Model", N_("Model"),
272 N_("The model name or model number of the equipment. This is the "
273 "model name or number of the DSC, scanner, video digitizer "
274 "or other equipment that generated the image. When the field "
275 "is left blank, it is treated as unknown."),
276 { ESL_OOOO, ESL_OOOO, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
277 {EXIF_TAG_STRIP_OFFSETS, "StripOffsets", N_("Strip Offsets"),
278 N_("For each strip, the byte offset of that strip. It is "
279 "recommended that this be selected so the number of strip "
280 "bytes does not exceed 64 Kbytes. With JPEG compressed "
281 "data this designation is not needed and is omitted. See also "
282 "<RowsPerStrip> and <StripByteCounts>."),
283 { ESL_MMMN, ESL_MMMN, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
284 {EXIF_TAG_ORIENTATION, "Orientation", N_("Orientation"),
285 N_("The image orientation viewed in terms of rows and columns."),
286 { ESL_OOOO, ESL_OOOO, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
287 {EXIF_TAG_SAMPLES_PER_PIXEL, "SamplesPerPixel",
288 N_("Samples per Pixel"),
289 N_("The number of components per pixel. Since this standard applies "
290 "to RGB and YCbCr images, the value set for this tag is 3. "
291 "In JPEG compressed data a JPEG marker is used instead of this "
293 { ESL_MMMN, ESL_MMMN, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
294 {EXIF_TAG_ROWS_PER_STRIP, "RowsPerStrip", N_("Rows per Strip"),
295 N_("The number of rows per strip. This is the number of rows "
296 "in the image of one strip when an image is divided into "
297 "strips. With JPEG compressed data this designation is not "
298 "needed and is omitted. See also <StripOffsets> and "
299 "<StripByteCounts>."),
300 { ESL_MMMN, ESL_MMMN, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
301 {EXIF_TAG_STRIP_BYTE_COUNTS, "StripByteCounts", N_("Strip Byte Count"),
302 N_("The total number of bytes in each strip. With JPEG compressed "
303 "data this designation is not needed and is omitted."),
304 { ESL_MMMN, ESL_MMMN, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
305 {EXIF_TAG_X_RESOLUTION, "XResolution", N_("X-Resolution"),
306 N_("The number of pixels per <ResolutionUnit> in the <ImageWidth> "
307 "direction. When the image resolution is unknown, 72 [dpi] "
309 { ESL_MMMM, ESL_MMMM, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
310 {EXIF_TAG_Y_RESOLUTION, "YResolution", N_("Y-Resolution"),
311 N_("The number of pixels per <ResolutionUnit> in the <ImageLength> "
312 "direction. The same value as <XResolution> is designated."),
313 { ESL_MMMM, ESL_MMMM, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
314 {EXIF_TAG_PLANAR_CONFIGURATION, "PlanarConfiguration",
315 N_("Planar Configuration"),
316 N_("Indicates whether pixel components are recorded in a chunky "
317 "or planar format. In JPEG compressed files a JPEG marker "
318 "is used instead of this tag. If this field does not exist, "
319 "the TIFF default of 1 (chunky) is assumed."),
320 { ESL_OMON, ESL_OMON, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
321 {EXIF_TAG_RESOLUTION_UNIT, "ResolutionUnit", N_("Resolution Unit"),
322 N_("The unit for measuring <XResolution> and <YResolution>. The same "
323 "unit is used for both <XResolution> and <YResolution>. If "
324 "the image resolution is unknown, 2 (inches) is designated."),
325 { ESL_MMMM, ESL_MMMM, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
326 {EXIF_TAG_TRANSFER_FUNCTION, "TransferFunction",
327 N_("Transfer Function"),
328 N_("A transfer function for the image, described in tabular style. "
329 "Normally this tag is not necessary, since color space is "
330 "specified in the color space information tag (<ColorSpace>)."),
331 { ESL_OOOO, ESL_OOOO, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
332 {EXIF_TAG_SOFTWARE, "Software", N_("Software"),
333 N_("This tag records the name and version of the software or "
334 "firmware of the camera or image input device used to "
335 "generate the image. The detailed format is not specified, but "
336 "it is recommended that the example shown below be "
337 "followed. When the field is left blank, it is treated as "
339 { ESL_OOOO, ESL_OOOO, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
340 {EXIF_TAG_DATE_TIME, "DateTime", N_("Date and Time"),
341 N_("The date and time of image creation. In this standard "
342 "(EXIF-2.1) it is the date and time the file was changed."),
343 { ESL_OOOO, ESL_OOOO, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
344 {EXIF_TAG_ARTIST, "Artist", N_("Artist"),
345 N_("This tag records the name of the camera owner, photographer or "
346 "image creator. The detailed format is not specified, but it is "
347 "recommended that the information be written as in the example "
348 "below for ease of Interoperability. When the field is "
349 "left blank, it is treated as unknown."),
350 { ESL_OOOO, ESL_OOOO, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
351 {EXIF_TAG_WHITE_POINT, "WhitePoint", N_("White Point"),
352 N_("The chromaticity of the white point of the image. Normally "
353 "this tag is not necessary, since color space is specified "
354 "in the color space information tag (<ColorSpace>)."),
355 { ESL_OOOO, ESL_OOOO, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
356 {EXIF_TAG_PRIMARY_CHROMATICITIES, "PrimaryChromaticities",
357 N_("Primary Chromaticities"),
358 N_("The chromaticity of the three primary colors of the image. "
359 "Normally this tag is not necessary, since color space is "
360 "specified in the color space information tag (<ColorSpace>)."),
361 { ESL_OOOO, ESL_OOOO, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
362 /* Not in EXIF 2.2 */
363 {EXIF_TAG_SUB_IFDS, "SubIFDs", "SubIFD Offsets", N_("Defined by Adobe Corporation "
364 "to enable TIFF Trees within a TIFF file."), ESL_UNKNOWN},
365 /* Not in EXIF 2.2 */
366 {EXIF_TAG_TRANSFER_RANGE, "TransferRange", N_("Transfer Range"), "",
368 /* Not in EXIF 2.2 */
369 {EXIF_TAG_JPEG_PROC, "JPEGProc", "JPEGProc", "", ESL_UNKNOWN},
370 {EXIF_TAG_JPEG_INTERCHANGE_FORMAT, "JPEGInterchangeFormat",
371 N_("JPEG Interchange Format"),
372 N_("The offset to the start byte (SOI) of JPEG compressed "
373 "thumbnail data. This is not used for primary image "
375 { ESL_NNNN, ESL_NNNM, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
376 {EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH,
377 "JPEGInterchangeFormatLength", N_("JPEG Interchange Format Length"),
378 N_("The number of bytes of JPEG compressed thumbnail data. This "
379 "is not used for primary image JPEG data. JPEG thumbnails "
380 "are not divided but are recorded as a continuous JPEG "
381 "bitstream from SOI to EOI. Appn and COM markers should "
382 "not be recorded. Compressed thumbnails must be recorded in no "
383 "more than 64 Kbytes, including all other data to be "
384 "recorded in APP1."),
385 { ESL_NNNN, ESL_NNNM, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
386 {EXIF_TAG_YCBCR_COEFFICIENTS, "YCbCrCoefficients",
387 N_("YCbCr Coefficients"),
388 N_("The matrix coefficients for transformation from RGB to YCbCr "
389 "image data. No default is given in TIFF; but here the "
390 "value given in \"Color Space Guidelines\", is used "
391 "as the default. The color space is declared in a "
392 "color space information tag, with the default being the value "
393 "that gives the optimal image characteristics "
394 "Interoperability this condition."),
395 { ESL_NNOO, ESL_NNOO, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
396 {EXIF_TAG_YCBCR_SUB_SAMPLING, "YCbCrSubSampling",
397 N_("YCbCr Sub-Sampling"),
398 N_("The sampling ratio of chrominance components in relation to the "
399 "luminance component. In JPEG compressed data a JPEG marker "
400 "is used instead of this tag."),
401 { ESL_NNMN, ESL_NNMN, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
402 {EXIF_TAG_YCBCR_POSITIONING, "YCbCrPositioning",
403 N_("YCbCr Positioning"),
404 N_("The position of chrominance components in relation to the "
405 "luminance component. This field is designated only for "
406 "JPEG compressed data or uncompressed YCbCr data. The TIFF "
407 "default is 1 (centered); but when Y:Cb:Cr = 4:2:2 it is "
408 "recommended in this standard that 2 (co-sited) be used to "
409 "record data, in order to improve the image quality when viewed "
410 "on TV systems. When this field does not exist, the reader shall "
411 "assume the TIFF default. In the case of Y:Cb:Cr = 4:2:0, the "
412 "TIFF default (centered) is recommended. If the reader "
413 "does not have the capability of supporting both kinds of "
414 "<YCbCrPositioning>, it shall follow the TIFF default regardless "
415 "of the value in this field. It is preferable that readers "
416 "be able to support both centered and co-sited positioning."),
417 { ESL_NNMM, ESL_NNOO, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
418 {EXIF_TAG_REFERENCE_BLACK_WHITE, "ReferenceBlackWhite",
419 N_("Reference Black/White"),
420 N_("The reference black point value and reference white point "
421 "value. No defaults are given in TIFF, but the values "
422 "below are given as defaults here. The color space is declared "
423 "in a color space information tag, with the default "
424 "being the value that gives the optimal image characteristics "
425 "Interoperability these conditions."),
426 { ESL_OOOO, ESL_OOOO, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
427 /* Not in EXIF 2.2 */
428 {EXIF_TAG_XML_PACKET, "XMLPacket", N_("XML Packet"), N_("XMP Metadata"),
430 /* Not in EXIF 2.2 */
431 {EXIF_TAG_RELATED_IMAGE_FILE_FORMAT, "RelatedImageFileFormat",
432 "RelatedImageFileFormat", "", ESL_UNKNOWN},
433 /* Not in EXIF 2.2 */
434 {EXIF_TAG_RELATED_IMAGE_WIDTH, "RelatedImageWidth",
435 "RelatedImageWidth", "", ESL_UNKNOWN},
436 /* Not in EXIF 2.2 */
437 {EXIF_TAG_RELATED_IMAGE_LENGTH, "RelatedImageLength",
438 "RelatedImageLength", "", ESL_UNKNOWN},
439 /* Not in EXIF 2.2 */
440 {EXIF_TAG_CFA_REPEAT_PATTERN_DIM, "CFARepeatPatternDim",
441 "CFARepeatPatternDim", "", ESL_UNKNOWN},
442 /* Not in EXIF 2.2 */
443 {EXIF_TAG_CFA_PATTERN, "CFAPattern",
445 N_("Indicates the color filter array (CFA) geometric pattern of the "
446 "image sensor when a one-chip color area sensor is used. "
447 "It does not apply to all sensing methods."), ESL_UNKNOWN},
448 /* Not in EXIF 2.2 */
449 {EXIF_TAG_BATTERY_LEVEL, "BatteryLevel", N_("Battery Level"), "",
451 {EXIF_TAG_COPYRIGHT, "Copyright", N_("Copyright"),
452 N_("Copyright information. In this standard the tag is used to "
453 "indicate both the photographer and editor copyrights. It is "
454 "the copyright notice of the person or organization claiming "
455 "rights to the image. The Interoperability copyright "
456 "statement including date and rights should be written in this "
457 "field; e.g., \"Copyright, John Smith, 19xx. All rights "
458 "reserved.\". In this standard the field records both the "
459 "photographer and editor copyrights, with each recorded in a "
460 "separate part of the statement. When there is a clear "
461 "distinction between the photographer and editor copyrights, "
462 "these are to be written in the order of photographer followed "
463 "by editor copyright, separated by NULL (in this case, "
464 "since the statement also ends with a NULL, there are two NULL "
465 "codes) (see example 1). When only the photographer is given, "
466 "it is terminated by one NULL code (see example 2). When only "
467 "the editor copyright is given, "
468 "the photographer copyright part consists of one space followed "
469 "by a terminating NULL code, then the editor copyright is given "
470 "(see example 3). When the field is left blank, it is treated "
472 { ESL_OOOO, ESL_OOOO, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
473 {EXIF_TAG_EXPOSURE_TIME, "ExposureTime", N_("Exposure Time"),
474 N_("Exposure time, given in seconds (sec)."),
475 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
476 {EXIF_TAG_FNUMBER, "FNumber", N_("F-Number"),
478 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
479 /* Not in EXIF 2.2 */
480 {EXIF_TAG_IPTC_NAA, "IPTC/NAA", "IPTC/NAA", "", ESL_UNKNOWN},
481 /* Not in EXIF 2.2 */
482 {EXIF_TAG_IMAGE_RESOURCES, "ImageResources", N_("Image Resources Block"), "",
484 {EXIF_TAG_EXIF_IFD_POINTER, "ExifIfdPointer", "ExifIFDPointer",
485 N_("A pointer to the Exif IFD. Interoperability, Exif IFD has the "
486 "same structure as that of the IFD specified in TIFF. "
487 "ordinarily, however, it does not contain image data as in "
488 "the case of TIFF."),
489 { ESL_NNNN, ESL_NNNN, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
490 /* Not in EXIF 2.2 */
491 {EXIF_TAG_INTER_COLOR_PROFILE, "InterColorProfile",
492 "InterColorProfile", "", ESL_UNKNOWN},
493 {EXIF_TAG_EXPOSURE_PROGRAM, "ExposureProgram", N_("Exposure Program"),
494 N_("The class of the program used by the camera to set exposure "
495 "when the picture is taken."),
496 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
497 {EXIF_TAG_SPECTRAL_SENSITIVITY, "SpectralSensitivity",
498 N_("Spectral Sensitivity"),
499 N_("Indicates the spectral sensitivity of each channel of the "
500 "camera used. The tag value is an ASCII string compatible "
501 "with the standard developed by the ASTM Technical Committee."),
502 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
503 {EXIF_TAG_GPS_INFO_IFD_POINTER, "GPSInfoIFDPointer",
504 N_("GPS Info IFD Pointer"),
505 N_("A pointer to the GPS Info IFD. The "
506 "Interoperability structure of the GPS Info IFD, like that of "
507 "Exif IFD, has no image data."),
508 { ESL_NNNN, ESL_NNNN, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
510 {EXIF_TAG_ISO_SPEED_RATINGS, "ISOSpeedRatings",
511 N_("ISO Speed Ratings"),
512 N_("Indicates the ISO Speed and ISO Latitude of the camera or "
513 "input device as specified in ISO 12232."),
514 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
515 {EXIF_TAG_OECF, "OECF", N_("Opto-Electronic Conversion Function"),
516 N_("Indicates the Opto-Electronic Conversion Function (OECF) "
517 "specified in ISO 14524. <OECF> is the relationship between "
518 "the camera optical input and the image values."),
519 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
520 /* Not in EXIF 2.2 */
521 {EXIF_TAG_TIME_ZONE_OFFSET, "TimeZoneOffset", N_("Time Zone Offset"),
522 N_("Encodes time zone of camera clock relative to GMT."),
524 {EXIF_TAG_EXIF_VERSION, "ExifVersion", N_("Exif Version"),
525 N_("The version of this standard supported. Nonexistence of this "
526 "field is taken to mean nonconformance to the standard."),
527 { ESL_NNNN, ESL_NNNN, ESL_MMMM, ESL_NNNN, ESL_NNNN } },
528 {EXIF_TAG_DATE_TIME_ORIGINAL, "DateTimeOriginal",
529 N_("Date and Time (Original)"),
530 N_("The date and time when the original image data was generated. "
531 "For a digital still camera "
532 "the date and time the picture was taken are recorded."),
533 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
534 {EXIF_TAG_DATE_TIME_DIGITIZED, "DateTimeDigitized",
535 N_("Date and Time (Digitized)"),
536 N_("The date and time when the image was stored as digital data."),
537 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
538 {EXIF_TAG_COMPONENTS_CONFIGURATION, "ComponentsConfiguration",
539 N_("Components Configuration"),
540 N_("Information specific to compressed data. The channels of "
541 "each component are arranged in order from the 1st "
542 "component to the 4th. For uncompressed data the data "
543 "arrangement is given in the <PhotometricInterpretation> tag. "
544 "However, since <PhotometricInterpretation> can only "
545 "express the order of Y, Cb and Cr, this tag is provided "
546 "for cases when compressed data uses components other than "
547 "Y, Cb, and Cr and to enable support of other sequences."),
548 { ESL_NNNN, ESL_NNNN, ESL_NNNM, ESL_NNNN, ESL_NNNN } },
549 {EXIF_TAG_COMPRESSED_BITS_PER_PIXEL, "CompressedBitsPerPixel",
550 N_("Compressed Bits per Pixel"),
551 N_("Information specific to compressed data. The compression mode "
552 "used for a compressed image is indicated in unit bits "
554 { ESL_NNNN, ESL_NNNN, ESL_NNNO, ESL_NNNN, ESL_NNNN } },
555 {EXIF_TAG_SHUTTER_SPEED_VALUE, "ShutterSpeedValue", N_("Shutter Speed"),
556 N_("Shutter speed. The unit is the APEX (Additive System of "
557 "Photographic Exposure) setting."),
558 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
559 {EXIF_TAG_APERTURE_VALUE, "ApertureValue", N_("Aperture"),
560 N_("The lens aperture. The unit is the APEX value."),
561 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
562 {EXIF_TAG_BRIGHTNESS_VALUE, "BrightnessValue", N_("Brightness"),
563 N_("The value of brightness. The unit is the APEX value. "
564 "Ordinarily it is given in the range of -99.99 to 99.99."),
565 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
566 {EXIF_TAG_EXPOSURE_BIAS_VALUE, "ExposureBiasValue",
568 N_("The exposure bias. The units is the APEX value. Ordinarily "
569 "it is given in the range of -99.99 to 99.99."),
570 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
571 {EXIF_TAG_MAX_APERTURE_VALUE, "MaxApertureValue", N_("Maximum Aperture Value"),
572 N_("The smallest F number of the lens. The unit is the APEX value. "
573 "Ordinarily it is given in the range of 00.00 to 99.99, "
574 "but it is not limited to this range."),
575 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
576 {EXIF_TAG_SUBJECT_DISTANCE, "SubjectDistance",
577 N_("Subject Distance"),
578 N_("The distance to the subject, given in meters."),
579 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
580 {EXIF_TAG_METERING_MODE, "MeteringMode", N_("Metering Mode"),
581 N_("The metering mode."),
582 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
583 {EXIF_TAG_LIGHT_SOURCE, "LightSource", N_("Light Source"),
584 N_("The kind of light source."),
585 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
586 {EXIF_TAG_FLASH, "Flash", N_("Flash"),
587 N_("This tag is recorded when an image is taken using a strobe "
589 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
590 {EXIF_TAG_FOCAL_LENGTH, "FocalLength", N_("Focal Length"),
591 N_("The actual focal length of the lens, in mm. Conversion is not "
592 "made to the focal length of a 35 mm film camera."),
593 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
594 {EXIF_TAG_SUBJECT_AREA, "SubjectArea", N_("Subject Area"),
595 N_("This tag indicates the location and area of the main subject "
596 "in the overall scene."),
597 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
598 /* Not in EXIF 2.2 */
599 {EXIF_TAG_TIFF_EP_STANDARD_ID, "TIFF/EPStandardID", N_("TIFF/EP Standard ID"), "",
601 {EXIF_TAG_MAKER_NOTE, "MakerNote", N_("Maker Note"),
602 N_("A tag for manufacturers of Exif writers to record any desired "
603 "information. The contents are up to the manufacturer."),
604 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
605 {EXIF_TAG_USER_COMMENT, "UserComment", N_("User Comment"),
606 N_("A tag for Exif users to write keywords or comments on the image "
607 "besides those in <ImageDescription>, and without the "
608 "character code limitations of the <ImageDescription> tag. The "
609 "character code used in the <UserComment> tag is identified "
610 "based on an ID code in a fixed 8-byte area at the start of "
611 "the tag data area. The unused portion of the area is padded "
612 "with NULL (\"00.h\"). ID codes are assigned by means of "
613 "registration. The designation method and references for each "
614 "character code are defined in the specification. The value of "
615 "CountN is determined based on the 8 bytes in the character code "
616 "area and the number of bytes in the user comment part. Since "
617 "the TYPE is not ASCII, NULL termination is not necessary. "
618 "The ID code for the <UserComment> area may be a Defined code "
619 "such as JIS or ASCII, or may be Undefined. The Undefined name "
620 "is UndefinedText, and the ID code is filled with 8 bytes of all "
621 "\"NULL\" (\"00.H\"). An Exif reader that reads the "
622 "<UserComment> tag must have a function for determining the "
623 "ID code. This function is not required in Exif readers that "
624 "do not use the <UserComment> tag. "
625 "When a <UserComment> area is set aside, it is recommended that "
626 "the ID code be ASCII and that the following user comment "
627 "part be filled with blank characters [20.H]."),
628 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
629 {EXIF_TAG_SUB_SEC_TIME, "SubsecTime", N_("Sub-second Time"),
630 N_("A tag used to record fractions of seconds for the "
632 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
633 {EXIF_TAG_SUB_SEC_TIME_ORIGINAL, "SubSecTimeOriginal",
634 N_("Sub-second Time (Original)"),
635 N_("A tag used to record fractions of seconds for the "
636 "<DateTimeOriginal> tag."),
637 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
638 {EXIF_TAG_SUB_SEC_TIME_DIGITIZED, "SubSecTimeDigitized",
639 N_("Sub-second Time (Digitized)"),
640 N_("A tag used to record fractions of seconds for the "
641 "<DateTimeDigitized> tag."),
642 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
643 /* Not in EXIF 2.2 (Microsoft extension) */
644 {EXIF_TAG_XP_TITLE, "XPTitle", N_("XP Title"),
645 N_("A character string giving the title of the image, encoded in "
647 { ESL_OOOO, ESL_NNNN, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
648 /* Not in EXIF 2.2 (Microsoft extension) */
649 {EXIF_TAG_XP_COMMENT, "XPComment", N_("XP Comment"),
650 N_("A character string containing a comment about the image, encoded "
652 { ESL_OOOO, ESL_NNNN, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
653 /* Not in EXIF 2.2 (Microsoft extension) */
654 {EXIF_TAG_XP_AUTHOR, "XPAuthor", N_("XP Author"),
655 N_("A character string containing the name of the image creator, "
656 "encoded in UTF-16LE."),
657 { ESL_OOOO, ESL_NNNN, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
658 /* Not in EXIF 2.2 (Microsoft extension) */
659 {EXIF_TAG_XP_KEYWORDS, "XPKeywords", N_("XP Keywords"),
660 N_("A character string containing key words describing the image, "
661 "encoded in UTF-16LE."),
662 { ESL_OOOO, ESL_NNNN, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
663 /* Not in EXIF 2.2 (Microsoft extension) */
664 {EXIF_TAG_XP_SUBJECT, "XPSubject", N_("XP Subject"),
665 N_("A character string giving the image subject, encoded in "
667 { ESL_OOOO, ESL_NNNN, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
668 {EXIF_TAG_FLASH_PIX_VERSION, "FlashPixVersion", "FlashPixVersion",
669 N_("The FlashPix format version supported by a FPXR file."),
670 { ESL_NNNN, ESL_NNNN, ESL_MMMM, ESL_NNNN, ESL_NNNN } },
671 {EXIF_TAG_COLOR_SPACE, "ColorSpace", N_("Color Space"),
672 N_("The color space information tag is always "
673 "recorded as the color space specifier. Normally sRGB (=1) "
674 "is used to define the color space based on the PC monitor "
675 "conditions and environment. If a color space other than "
676 "sRGB is used, Uncalibrated (=FFFF.H) is set. Image data "
677 "recorded as Uncalibrated can be treated as sRGB when it is "
678 "converted to FlashPix."),
679 { ESL_NNNN, ESL_NNNN, ESL_MMMM, ESL_NNNN, ESL_NNNN } },
680 {EXIF_TAG_PIXEL_X_DIMENSION, "PixelXDimension", N_("Pixel X Dimension"),
681 N_("Information specific to compressed data. When a "
682 "compressed file is recorded, the valid width of the "
683 "meaningful image must be recorded in this tag, whether or "
684 "not there is padding data or a restart marker. This tag "
685 "should not exist in an uncompressed file."),
686 { ESL_NNNN, ESL_NNNN, ESL_NNNM, ESL_NNNN, ESL_NNNN } },
687 {EXIF_TAG_PIXEL_Y_DIMENSION, "PixelYDimension", N_("Pixel Y Dimension"),
688 N_("Information specific to compressed data. When a compressed "
689 "file is recorded, the valid height of the meaningful image "
690 "must be recorded in this tag, whether or not there is padding "
691 "data or a restart marker. This tag should not exist in an "
692 "uncompressed file. "
693 "Since data padding is unnecessary in the vertical direction, "
694 "the number of lines recorded in this valid image height tag "
695 "will in fact be the same as that recorded in the SOF."),
696 { ESL_NNNN, ESL_NNNN, ESL_NNNM, ESL_NNNN, ESL_NNNN } },
697 {EXIF_TAG_RELATED_SOUND_FILE, "RelatedSoundFile",
698 N_("Related Sound File"),
699 N_("This tag is used to record the name of an audio file related "
700 "to the image data. The only relational information "
701 "recorded here is the Exif audio file name and extension (an "
702 "ASCII string consisting of 8 characters + '.' + 3 "
703 "characters). The path is not recorded. Stipulations on audio "
704 "and file naming conventions are defined in the specification. "
705 "When using this tag, audio files must be recorded in "
706 "conformance to the Exif audio format. Writers are also allowed "
707 "to store the data such as Audio within APP2 as FlashPix "
708 "extension stream data. "
709 "The mapping of Exif image files and audio files is done "
710 "in any of three ways, [1], [2] and [3]. If multiple files "
711 "are mapped to one file as in [2] or [3], the above "
712 "format is used to record just one audio file name. If "
713 "there are multiple audio files, the first recorded file is "
714 "given. In the case of [3], for example, for the "
715 "Exif image file \"DSC00001.JPG\" only \"SND00001.WAV\" is "
716 "given as the related Exif audio file. When there are three "
717 "Exif audio files \"SND00001.WAV\", \"SND00002.WAV\" and "
718 "\"SND00003.WAV\", the Exif image file name for each of them, "
719 "\"DSC00001.JPG\", is indicated. By combining multiple "
720 "relational information, a variety of playback possibilities "
721 "can be supported. The method of using relational information "
722 "is left to the implementation on the playback side. Since this "
723 "information is an ASCII character string, it is terminated by "
724 "NULL. When this tag is used to map audio files, the relation "
725 "of the audio file to image data must also be indicated on the "
727 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
728 {EXIF_TAG_INTEROPERABILITY_IFD_POINTER, "InteroperabilityIFDPointer",
729 N_("Interoperability IFD Pointer"),
730 N_("Interoperability IFD is composed of tags which stores the "
731 "information to ensure the Interoperability and pointed "
732 "by the following tag located in Exif IFD. "
733 "The Interoperability structure of Interoperability IFD is "
734 "the same as TIFF defined IFD structure "
735 "but does not contain the "
736 "image data characteristically compared with normal TIFF "
738 { ESL_NNNN, ESL_NNNN, ESL_NNNN, ESL_NNNN, ESL_NNNN } },
739 {EXIF_TAG_FLASH_ENERGY, "FlashEnergy", N_("Flash Energy"),
740 N_("Indicates the strobe energy at the time the image is "
741 "captured, as measured in Beam Candle Power Seconds (BCPS)."),
742 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
743 {EXIF_TAG_SPATIAL_FREQUENCY_RESPONSE, "SpatialFrequencyResponse",
744 N_("Spatial Frequency Response"),
745 N_("This tag records the camera or input device spatial frequency "
746 "table and SFR values in the direction of image width, "
747 "image height, and diagonal direction, as specified in ISO "
749 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
750 {EXIF_TAG_FOCAL_PLANE_X_RESOLUTION, "FocalPlaneXResolution",
751 N_("Focal Plane X-Resolution"),
752 N_("Indicates the number of pixels in the image width (X) direction "
753 "per <FocalPlaneResolutionUnit> on the camera focal plane."),
754 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
755 {EXIF_TAG_FOCAL_PLANE_Y_RESOLUTION, "FocalPlaneYResolution",
756 N_("Focal Plane Y-Resolution"),
757 N_("Indicates the number of pixels in the image height (V) direction "
758 "per <FocalPlaneResolutionUnit> on the camera focal plane."),
759 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
760 {EXIF_TAG_FOCAL_PLANE_RESOLUTION_UNIT, "FocalPlaneResolutionUnit",
761 N_("Focal Plane Resolution Unit"),
762 N_("Indicates the unit for measuring <FocalPlaneXResolution> and "
763 "<FocalPlaneYResolution>. This value is the same as the "
764 "<ResolutionUnit>."),
765 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
766 {EXIF_TAG_SUBJECT_LOCATION, "SubjectLocation",
767 N_("Subject Location"),
768 N_("Indicates the location of the main subject in the scene. The "
769 "value of this tag represents the pixel at the center of the "
770 "main subject relative to the left edge, prior to rotation "
771 "processing as per the <Rotation> tag. The first value "
772 "indicates the X column number and the second indicates "
773 "the Y row number."),
774 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
775 {EXIF_TAG_EXPOSURE_INDEX, "ExposureIndex", N_("Exposure Index"),
776 N_("Indicates the exposure index selected on the camera or "
777 "input device at the time the image is captured."),
778 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
779 {EXIF_TAG_SENSING_METHOD, "SensingMethod", N_("Sensing Method"),
780 N_("Indicates the image sensor type on the camera or input "
782 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
783 {EXIF_TAG_FILE_SOURCE, "FileSource", N_("File Source"),
784 N_("Indicates the image source. If a DSC recorded the image, "
785 "the tag value of this tag always be set to 3, indicating "
786 "that the image was recorded on a DSC."),
787 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
788 {EXIF_TAG_SCENE_TYPE, "SceneType", N_("Scene Type"),
789 N_("Indicates the type of scene. If a DSC recorded the image, "
790 "this tag value must always be set to 1, indicating that the "
791 "image was directly photographed."),
792 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
793 {EXIF_TAG_NEW_CFA_PATTERN, "CFAPattern",
795 N_("Indicates the color filter array (CFA) geometric pattern of the "
796 "image sensor when a one-chip color area sensor is used. "
797 "It does not apply to all sensing methods."),
798 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
799 {EXIF_TAG_CUSTOM_RENDERED, "CustomRendered", N_("Custom Rendered"),
800 N_("This tag indicates the use of special processing on image "
801 "data, such as rendering geared to output. When special "
802 "processing is performed, the reader is expected to disable "
803 "or minimize any further processing."),
804 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
805 {EXIF_TAG_EXPOSURE_MODE, "ExposureMode", N_("Exposure Mode"),
806 N_("This tag indicates the exposure mode set when the image was "
807 "shot. In auto-bracketing mode, the camera shoots a series of "
808 "frames of the same scene at different exposure settings."),
809 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
810 {EXIF_TAG_WHITE_BALANCE, "WhiteBalance", N_("White Balance"),
811 N_("This tag indicates the white balance mode set when the image "
813 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
814 {EXIF_TAG_DIGITAL_ZOOM_RATIO, "DigitalZoomRatio",
815 N_("Digital Zoom Ratio"),
816 N_("This tag indicates the digital zoom ratio when the image was "
817 "shot. If the numerator of the recorded value is 0, this "
818 "indicates that digital zoom was not used."),
819 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
820 {EXIF_TAG_FOCAL_LENGTH_IN_35MM_FILM, "FocalLengthIn35mmFilm",
821 N_("Focal Length in 35mm Film"),
822 N_("This tag indicates the equivalent focal length assuming a "
823 "35mm film camera, in mm. A value of 0 means the focal "
824 "length is unknown. Note that this tag differs from the "
826 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
827 {EXIF_TAG_SCENE_CAPTURE_TYPE, "SceneCaptureType",
828 N_("Scene Capture Type"),
829 N_("This tag indicates the type of scene that was shot. It can "
830 "also be used to record the mode in which the image was "
831 "shot. Note that this differs from the scene type "
833 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
834 {EXIF_TAG_GAIN_CONTROL, "GainControl", N_("Gain Control"),
835 N_("This tag indicates the degree of overall image gain "
837 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
838 {EXIF_TAG_CONTRAST, "Contrast", N_("Contrast"),
839 N_("This tag indicates the direction of contrast processing "
840 "applied by the camera when the image was shot."),
841 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
842 {EXIF_TAG_SATURATION, "Saturation", N_("Saturation"),
843 N_("This tag indicates the direction of saturation processing "
844 "applied by the camera when the image was shot."),
845 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
846 {EXIF_TAG_SHARPNESS, "Sharpness", N_("Sharpness"),
847 N_("This tag indicates the direction of sharpness processing "
848 "applied by the camera when the image was shot."),
849 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
850 {EXIF_TAG_DEVICE_SETTING_DESCRIPTION, "DeviceSettingDescription",
851 N_("Device Setting Description"),
852 N_("This tag indicates information on the picture-taking "
853 "conditions of a particular camera model. The tag is used "
854 "only to indicate the picture-taking conditions in the "
856 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
857 {EXIF_TAG_SUBJECT_DISTANCE_RANGE, "SubjectDistanceRange",
858 N_("Subject Distance Range"),
859 N_("This tag indicates the distance to the subject."),
860 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
861 {EXIF_TAG_IMAGE_UNIQUE_ID, "ImageUniqueID", N_("Image Unique ID"),
862 N_("This tag indicates an identifier assigned uniquely to "
863 "each image. It is recorded as an ASCII string equivalent "
864 "to hexadecimal notation and 128-bit fixed length."),
865 { ESL_NNNN, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
866 /* Not in EXIF 2.2 */
867 {EXIF_TAG_GAMMA, "Gamma", N_("Gamma"),
868 N_("Indicates the value of coefficient gamma."),
870 /* Not in EXIF 2.2 */
871 {EXIF_TAG_PRINT_IMAGE_MATCHING, "PrintImageMatching", N_("PRINT Image Matching"),
872 N_("Related to Epson's PRINT Image Matching technology"),
874 /* Not in EXIF 2.2 (from the Microsoft HD Photo specification) */
875 {EXIF_TAG_PADDING, "Padding", N_("Padding"),
876 N_("This tag reserves space that can be reclaimed later when "
877 "additional metadata are added. New metadata can be written "
878 "in place by replacing this tag with a smaller data element "
879 "and using the reclaimed space to store the new or expanded "
881 { ESL_OOOO, ESL_NNNN, ESL_OOOO, ESL_NNNN, ESL_NNNN } },
883 {0, NULL, NULL, NULL, ESL_UNKNOWN}
886 /* For now, do not use these functions. */
889 * Return the number of entries in the EXIF tag table, including the
890 * terminating NULL entry.
893 exif_tag_table_count (void)
895 return sizeof (ExifTagTable) / sizeof (ExifTagTable[0]);
900 exif_tag_table_get_tag (unsigned int n)
902 return (n < exif_tag_table_count ()) ? ExifTagTable[n].tag : 0;
906 exif_tag_table_get_name (unsigned int n)
908 return (n < exif_tag_table_count ()) ? ExifTagTable[n].name : NULL;
912 * Compares the tag with that in entry.
913 * \param[in] tag pointer to integer tag value
914 * \param[in] entry pointer to a struct TagEntry
915 * \return 0 if tags are equal, <0 if tag < entry, >0 if tag > entry
918 match_tag(const void *tag, const void *entry)
920 return *(int*)tag - ((struct TagEntry *)entry)->tag;
925 * Finds the first entry in the EXIF tag table with the given tag number
926 * using a binary search.
927 * \param[in] tag to find
928 * \return index into table, or -1 if not found
931 exif_tag_table_first(ExifTag tag)
934 struct TagEntry *entry = bsearch(&tag, ExifTagTable,
935 exif_tag_table_count()-1, sizeof(struct TagEntry), match_tag);
937 return -1; /* Not found */
939 /* Calculate index of found entry */
940 i = entry - ExifTagTable;
942 /* There may be other entries with the same tag number, so search
943 * backwards to find the first
945 while ((i > 0) && (ExifTagTable[i-1].tag == tag)) {
952 ((ExifTagTable[i].esl[ifd][EXIF_DATA_TYPE_UNCOMPRESSED_CHUNKY] != EXIF_SUPPORT_LEVEL_NOT_RECORDED) || \
953 (ExifTagTable[i].esl[ifd][EXIF_DATA_TYPE_UNCOMPRESSED_PLANAR] != EXIF_SUPPORT_LEVEL_NOT_RECORDED) || \
954 (ExifTagTable[i].esl[ifd][EXIF_DATA_TYPE_UNCOMPRESSED_YCC] != EXIF_SUPPORT_LEVEL_NOT_RECORDED) || \
955 (ExifTagTable[i].esl[ifd][EXIF_DATA_TYPE_COMPRESSED] != EXIF_SUPPORT_LEVEL_NOT_RECORDED))
958 exif_tag_get_name_in_ifd (ExifTag tag, ExifIfd ifd)
963 if (ifd >= EXIF_IFD_COUNT)
965 first = exif_tag_table_first(tag);
969 for (i = first; ExifTagTable[i].name; i++) {
970 if (ExifTagTable[i].tag == tag) {
974 return NULL; /* Recorded tag not found in the table */
976 return ExifTagTable[i].name;
980 exif_tag_get_title_in_ifd (ExifTag tag, ExifIfd ifd)
985 if (ifd >= EXIF_IFD_COUNT)
987 first = exif_tag_table_first(tag);
991 for (i = first; ExifTagTable[i].name; i++) {
992 if (ExifTagTable[i].tag == tag) {
996 return NULL; /* Recorded tag not found in the table */
998 bindtextdomain (GETTEXT_PACKAGE, LOCALEDIR);
999 return _(ExifTagTable[i].title);
1003 exif_tag_get_description_in_ifd (ExifTag tag, ExifIfd ifd)
1008 if (ifd >= EXIF_IFD_COUNT)
1010 first = exif_tag_table_first(tag);
1014 for (i = first; ExifTagTable[i].name; i++) {
1015 if (ExifTagTable[i].tag == tag) {
1019 return NULL; /* Recorded tag not found in the table */
1022 /* GNU gettext acts strangely when given an empty string */
1023 if (!ExifTagTable[i].description || !*ExifTagTable[i].description)
1026 /* libexif should use the default system locale.
1027 * If an application specifically requires UTF-8, then we
1028 * must give the application a way to tell libexif that.
1030 * bind_textdomain_codeset (GETTEXT_PACKAGE, "UTF-8");
1032 bindtextdomain (GETTEXT_PACKAGE, LOCALEDIR);
1033 return _(ExifTagTable[i].description);
1037 /**********************************************************************
1038 * convenience functions
1039 **********************************************************************/
1041 /* generic part: iterate through IFD list and return first result */
1042 typedef const char * (*get_stuff_func) (ExifTag tag, ExifIfd ifd);
1045 exif_tag_get_stuff (ExifTag tag, get_stuff_func func)
1047 /* Search IFDs in this order, in decreasing order of number of valid tags */
1048 static const ExifIfd ifds[EXIF_IFD_COUNT] = {
1052 EXIF_IFD_INTEROPERABILITY,
1056 for (i=0; i<EXIF_IFD_COUNT; i++) {
1057 const char *result = func(tag, ifds[i]);
1058 if (result != NULL) {
1062 return (const char *) NULL;
1065 /* explicit functions */
1067 exif_tag_get_name (ExifTag tag)
1069 return exif_tag_get_stuff(tag, exif_tag_get_name_in_ifd);
1073 exif_tag_get_title (ExifTag tag)
1075 return exif_tag_get_stuff(tag, exif_tag_get_title_in_ifd);
1079 exif_tag_get_description (ExifTag tag)
1081 return exif_tag_get_stuff(tag, exif_tag_get_description_in_ifd);
1087 exif_tag_from_name (const char *name)
1090 unsigned int result=0;
1092 if (!name) return 0;
1094 for (i = 0; ExifTagTable[i].name; i++)
1095 if (!strcmp (ExifTagTable[i].name, name)) {
1096 result = ExifTagTable[i].tag;
1102 /*! Return the support level of a tag in the given IFD with the given data
1103 * type. If the tag is not specified in the EXIF standard, this function
1104 * returns EXIF_SUPPORT_LEVEL_NOT_RECORDED.
1106 * \param[in] tag EXIF tag
1107 * \param[in] ifd a valid IFD (not EXIF_IFD_COUNT)
1108 * \param[in] t a valid data type (not EXIF_DATA_TYPE_UNKNOWN)
1109 * \return the level of support for this tag
1111 static inline ExifSupportLevel
1112 get_support_level_in_ifd (ExifTag tag, ExifIfd ifd, ExifDataType t)
1115 int first = exif_tag_table_first(tag);
1117 return EXIF_SUPPORT_LEVEL_NOT_RECORDED;
1119 for (i = first; ExifTagTable[i].name; i++) {
1120 if (ExifTagTable[i].tag == tag) {
1121 const ExifSupportLevel supp = ExifTagTable[i].esl[ifd][t];
1122 if (supp != EXIF_SUPPORT_LEVEL_NOT_RECORDED)
1124 /* Try looking for another entry */
1126 break; /* We've reached the end of the matching tags */
1129 return EXIF_SUPPORT_LEVEL_NOT_RECORDED;
1132 /*! Return the support level of a tag in the given IFD, regardless of the
1133 * data type. If the support level varies depending on the data type, this
1134 * function returns EXIF_SUPPORT_LEVEL_UNKNOWN. If the tag is not specified
1135 * in the EXIF standard, this function returns EXIF_SUPPORT_LEVEL_UNKNOWN.
1137 * \param[in] tag EXIF tag
1138 * \param[in] ifd a valid IFD (not EXIF_IFD_COUNT)
1139 * \return the level of support for this tag
1141 static inline ExifSupportLevel
1142 get_support_level_any_type (ExifTag tag, ExifIfd ifd)
1145 int first = exif_tag_table_first(tag);
1147 return EXIF_SUPPORT_LEVEL_UNKNOWN;
1149 for (i = first; ExifTagTable[i].name; i++) {
1150 if (ExifTagTable[i].tag == tag) {
1152 * Check whether the support level is the same for all possible
1153 * data types and isn't marked not recorded.
1155 const ExifSupportLevel supp = ExifTagTable[i].esl[ifd][0];
1156 /* If level is not recorded, keep searching for another */
1157 if (supp != EXIF_SUPPORT_LEVEL_NOT_RECORDED) {
1159 for (dt = 0; dt < EXIF_DATA_TYPE_COUNT; ++dt) {
1160 if (ExifTagTable[i].esl[ifd][dt] != supp)
1163 if (dt == EXIF_DATA_TYPE_COUNT)
1164 /* Support level is always the same, so return it */
1167 /* Keep searching the table for another tag for our IFD */
1169 break; /* We've reached the end of the matching tags */
1172 return EXIF_SUPPORT_LEVEL_UNKNOWN;
1176 exif_tag_get_support_level_in_ifd (ExifTag tag, ExifIfd ifd, ExifDataType t)
1178 if (ifd >= EXIF_IFD_COUNT)
1179 return EXIF_SUPPORT_LEVEL_UNKNOWN;
1181 if (t >= EXIF_DATA_TYPE_COUNT)
1182 return get_support_level_any_type (tag, ifd);
1184 return get_support_level_in_ifd (tag, ifd, t);