3 * Copyright © 2001 Lutz Müller <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., 59 Temple Place - Suite 330,
18 * Boston, MA 02111-1307, USA.
28 ESL_MANDATORY = 1, /* Mandatory */
29 ESL_CMANDATORY = 2, /* Conditionally mandatory */
30 ESL_OPTIONAL = 3, /* Optional */
31 ESL_NOT_RECORDED = 4 /* Not recorded */
32 } ExifSL; /* Exif Support Level */
38 const char *description;
39 ExifSL esl_0[4], esl_1[4], esl_exif[4], esl_gps[4];
41 {EXIF_TAG_NEW_SUBFILE_TYPE, "NewSubfileType",
42 "New Subfile Type", N_("A general indication of the kind of data "
43 "contained in this subfile.")},
44 {EXIF_TAG_INTEROPERABILITY_INDEX, "InteroperabilityIndex",
45 "InteroperabilityIndex",
46 N_("Indicates the identification of the Interoperability rule. "
47 "Use \"R98\" for stating ExifR98 Rules. Four bytes used "
48 "including the termination code (NULL). see the separate "
49 "volume of Recommended Exif Interoperability Rules (ExifR98) "
50 "for other tags used for ExifR98.")},
51 {EXIF_TAG_INTEROPERABILITY_VERSION, "InteroperabilityVersion",
52 "InteroperabilityVersion", ""},
53 {EXIF_TAG_IMAGE_WIDTH, "ImageWidth", N_("Image Width"),
54 N_("The number of columns of image data, equal to the number of "
55 "pixels per row. In JPEG compressed data a JPEG marker is "
56 "used instead of this tag."),
57 {ESL_MANDATORY, ESL_MANDATORY, ESL_MANDATORY, ESL_NOT_RECORDED}},
58 {EXIF_TAG_IMAGE_LENGTH, "ImageLength", N_("Image Length"),
59 N_("The number of rows of image data. In JPEG compressed data a "
60 "JPEG marker is used instead of this tag."),
61 {ESL_MANDATORY, ESL_MANDATORY, ESL_MANDATORY, ESL_NOT_RECORDED}},
62 {EXIF_TAG_BITS_PER_SAMPLE, "BitsPerSample", N_("Bits per Sample"),
63 N_("The number of bits per image component. In this standard each "
64 "component of the image is 8 bits, so the value for this "
65 "tag is 9. See also <SamplesPerPixel>. In JPEG compressed data "
66 "a JPEG marker is used instead of this tag."),
67 {ESL_MANDATORY, ESL_MANDATORY, ESL_MANDATORY, ESL_NOT_RECORDED}},
68 {EXIF_TAG_COMPRESSION, "Compression", N_("Compression"),
69 N_("The compression scheme used for the image data. When a "
70 "primary image is JPEG compressed, this designation is "
71 "not necessary and is omitted. When thumbnails use JPEG "
72 "compression, this tag value is set to 6."),
73 {ESL_MANDATORY, ESL_MANDATORY, ESL_MANDATORY, ESL_NOT_RECORDED}},
74 {EXIF_TAG_PHOTOMETRIC_INTERPRETATION, "PhotometricInterpretation",
75 N_("Photometric Interpretation"),
76 N_("The pixel composition. In JPEG compressed data a JPEG "
77 "marker is used instead of this tag."),
78 {ESL_MANDATORY, ESL_MANDATORY, ESL_MANDATORY, ESL_NOT_RECORDED}},
79 {EXIF_TAG_FILL_ORDER, "FillOrder", N_("Fill Order"), ""},
80 {EXIF_TAG_DOCUMENT_NAME, "DocumentName", N_("Document Name"), ""},
81 {EXIF_TAG_IMAGE_DESCRIPTION, "ImageDescription",
82 N_("Image Description"),
83 N_("A character string giving the title of the image. It may be "
84 "a comment such as \"1988 company picnic\" or "
85 "the like. Two-bytes character codes cannot be used. "
86 "When a 2-bytes code is necessary, the Exif Private tag "
87 "<UserComment> is to be used."),
88 {ESL_CMANDATORY, ESL_CMANDATORY, ESL_CMANDATORY, ESL_CMANDATORY}},
89 {EXIF_TAG_MAKE, "Make", N_("Manufacturer"),
90 N_("The manufacturer of the recording "
91 "equipment. This is the manufacturer of the DSC, scanner, "
92 "video digitizer or other equipment that generated the "
93 "image. When the field is left blank, it is treated as "
95 {ESL_CMANDATORY, ESL_CMANDATORY, ESL_CMANDATORY, ESL_CMANDATORY}},
96 {EXIF_TAG_MODEL, "Model", N_("Model"),
97 N_("The model name or model number of the equipment. This is the "
98 "model name or number of the DSC, scanner, video digitizer "
99 "or other equipment that generated the image. When the field "
100 "is left blank, it is treated as unknown."),
101 {ESL_CMANDATORY, ESL_CMANDATORY, ESL_CMANDATORY, ESL_CMANDATORY}},
102 {EXIF_TAG_STRIP_OFFSETS, "StripOffsets", N_("Strip Offsets"),
103 N_("For each strip, the byte offset of that strip. It is "
104 "recommended that this be selected so the number of strip "
105 "bytes does not exceed 64 Kbytes. With JPEG compressed "
106 "data this designation is not needed and is omitted. See also "
107 "<RowsPerStrip> and <StripByteCounts>."),
108 {ESL_CMANDATORY, ESL_CMANDATORY, ESL_CMANDATORY, ESL_CMANDATORY}},
109 {EXIF_TAG_ORIENTATION, "Orientation", N_("Orientation"),
110 N_("The image orientation viewed in terms of rows and columns."),
111 {ESL_CMANDATORY, ESL_CMANDATORY, ESL_CMANDATORY, ESL_CMANDATORY}},
112 {EXIF_TAG_SAMPLES_PER_PIXEL, "SamplesPerPixel",
113 N_("Samples per Pixel"),
114 N_("The number of components per pixel. Since this standard applies "
115 "to RGB and YCbCr images, the value set for this tag is 3. "
116 "In JPEG compressed data a JPEG marker is used instead of this "
118 {EXIF_TAG_ROWS_PER_STRIP, "RowsPerStrip", N_("Rows per Strip"),
119 N_("The number of rows per strip. This is the number of rows "
120 "in the image of one strip when an image is divided into "
121 "strips. With JPEG compressed data this designation is not "
122 "needed and is omitted. See also <RowsPerStrip> and "
123 "<StripByteCounts>.")},
124 {EXIF_TAG_STRIP_BYTE_COUNTS, "StripByteCounts", N_("Strip Byte Count"),
125 N_("The total number of bytes in each strip. With JPEG compressed "
126 "data this designation is not needed and is omitted.")},
127 {EXIF_TAG_X_RESOLUTION, "XResolution", N_("x-Resolution"),
128 N_("The number of pixels per <ResolutionUnit> in the <ImageWidth> "
129 "direction. When the image resolution is unknown, 72 [dpi] "
131 {EXIF_TAG_Y_RESOLUTION, "YResolution", N_("y-Resolution"),
132 N_("The number of pixels per <ResolutionUnit> in the <ImageLength> "
133 "direction. The same value as <XResolution> is designated.")},
134 {EXIF_TAG_PLANAR_CONFIGURATION, "PlanarConfiguration",
135 N_("Planar Configuration"),
136 N_("Indicates whether pixel components are recorded in a chunky "
137 "or planar format. In JPEG compressed files a JPEG marker "
138 "is used instead of this tag. If this field does not exist, "
139 "the TIFF default of 1 (chunky) is assumed.")},
140 {EXIF_TAG_RESOLUTION_UNIT, "ResolutionUnit", N_("Resolution Unit"),
141 N_("The unit for measuring <XResolution> and <YResolution>. The same "
142 "unit is used for both <XResolution> and <YResolution>. If "
143 "the image resolution is unknown, 2 (inches) is designated.")},
144 {EXIF_TAG_TRANSFER_FUNCTION, "TransferFunction",
145 N_("Transfer Function"),
146 N_("A transfer function for the image, described in tabular style. "
147 "Normally this tag is not necessary, since color space is "
148 "specified in the color space information tag (<ColorSpace>).")},
149 {EXIF_TAG_SOFTWARE, "Software", N_("Software"),
150 N_("This tag records the name and version of the software or "
151 "firmware of the camera or image input device used to "
152 "generate the image. The detailed format is not specified, but "
153 "it is recommended that the example shown below be "
154 "followed. When the field is left blank, it is treated as "
156 {EXIF_TAG_DATE_TIME, "DateTime", N_("Date and Time"),
157 N_("The date and time of image creation. In this standard "
158 "(EXIF-2.1) it is the date and time the file was changed.")},
159 {EXIF_TAG_ARTIST, "Artist", N_("Artist"),
160 N_("This tag records the name of the camera owner, photographer or "
161 "image creator. The detailed format is not specified, but it is "
162 "recommended that the information be written as in the example "
163 "below for ease of Interoperability. When the field is "
164 "left blank, it is treated as unknown.")},
165 {EXIF_TAG_WHITE_POINT, "WhitePoint", N_("White Point"),
166 N_("The chromaticity of the white point of the image. Normally "
167 "this tag is not necessary, since color space is specified "
168 "in the colorspace information tag (<ColorSpace>).")},
169 {EXIF_TAG_PRIMARY_CHROMATICITIES, "PrimaryChromaticities",
170 N_("Primary Chromaticities"),
171 N_("The chromaticity of the three primary colors of the image. "
172 "Normally this tag is not necessary, since colorspace is "
173 "specified in the colorspace information tag (<ColorSpace>).")},
174 {EXIF_TAG_TRANSFER_RANGE, "TransferRange", N_("Transfer Range"), ""},
175 {EXIF_TAG_SUB_IFDS, "SubIFDs", "SubIFD Offsets", N_("Defined by Adobe Corporation "
176 "to enable TIFF Trees within a TIFF file.")},
177 {EXIF_TAG_JPEG_PROC, "JPEGProc", "JPEGProc", ""},
178 {EXIF_TAG_JPEG_INTERCHANGE_FORMAT, "JPEGInterchangeFormat",
179 N_("JPEG Interchange Format"),
180 N_("The offset to the start byte (SOI) of JPEG compressed "
181 "thumbnail data. This is not used for primary image "
183 {EXIF_TAG_JPEG_INTERCHANGE_FORMAT_LENGTH,
184 "JPEGInterchangeFormatLength", N_("JPEG Interchange Format Length"),
185 N_("The number of bytes of JPEG compressed thumbnail data. This "
186 "is not used for primary image JPEG data. JPEG thumbnails "
187 "are not divided but are recorded as a continuous JPEG "
188 "bitstream from SOI to EOI. Appn and COM markers should "
189 "not be recorded. Compressed thumbnails must be recorded in no "
190 "more than 64 Kbytes, including all other data to be "
191 "recorded in APP1.")},
192 {EXIF_TAG_YCBCR_COEFFICIENTS, "YCbCrCoefficients",
193 N_("YCbCr Coefficients"),
194 N_("The matrix coefficients for transformation from RGB to YCbCr "
195 "image data. No default is given in TIFF; but here the "
196 "value given in Appendix E, \"Color Space Guidelines\", is used "
197 "as the default. The color space is declared in a "
198 "color space information tag, with the default being the value "
199 "that gives the optimal image characteristics "
200 "Interoperability this condition.")},
201 {EXIF_TAG_YCBCR_SUB_SAMPLING, "YCbCrSubSampling",
202 N_("YCbCr Sub-Sampling"),
203 N_("The sampling ratio of chrominance components in relation to the "
204 "luminance component. In JPEG compressed data a JPEG marker "
205 "is used instead of this tag.")},
206 {EXIF_TAG_YCBCR_POSITIONING, "YCbCrPositioning",
207 N_("YCbCr Positioning"),
208 N_("The position of chrominance components in relation to the "
209 "luminance component. This field is designated only for "
210 "JPEG compressed data or uncompressed YCbCr data. The TIFF "
211 "default is 1 (centered); but when Y:Cb:Cr = 4:2:2 it is "
212 "recommended in this standard that 2 (co-sited) be used to "
213 "record data, in order to improve the image quality when viewed "
214 "on TV systems. When this field does not exist, the reader shall "
215 "assume the TIFF default. In the case of Y:Cb:Cr = 4:2:0, the "
216 "TIFF default (centered) is recommended. If the reader "
217 "does not have the capability of supporting both kinds of "
218 "<YCbCrPositioning>, it shall follow the TIFF default regardless "
219 "of the value in this field. It is preferable that readers "
220 "be able to support both centered and co-sited positioning.")},
221 {EXIF_TAG_REFERENCE_BLACK_WHITE, "ReferenceBlackWhite",
222 N_("Reference Black/White"),
223 N_("The reference black point value and reference white point "
224 "value. No defaults are given in TIFF, but the values "
225 "below are given as defaults here. The color space is declared "
226 "in a color space information tag, with the default "
227 "being the value that gives the optimal image characteristics "
228 "Interoperability these conditions.")},
229 {EXIF_TAG_XML_PACKET, "XMLPacket", N_("XML Packet"), N_("XMP Metadata")},
230 {EXIF_TAG_RELATED_IMAGE_FILE_FORMAT, "RelatedImageFileFormat",
231 "RelatedImageFileFormat", ""},
232 {EXIF_TAG_RELATED_IMAGE_WIDTH, "RelatedImageWidth",
233 "RelatedImageWidth", ""},
234 {EXIF_TAG_RELATED_IMAGE_LENGTH, "RelatedImageLength",
235 "RelatedImageLength", ""},
236 {EXIF_TAG_CFA_REPEAT_PATTERN_DIM, "CFARepeatPatternDim",
237 "CFARepeatPatternDim", ""},
238 {EXIF_TAG_CFA_PATTERN, "CFAPattern",
240 N_("Indicates the color filter array (CFA) geometric pattern of the "
241 "image sensor when a one-chip color area sensor is used. "
242 "It does not apply to all sensing methods.")},
243 {EXIF_TAG_BATTERY_LEVEL, "BatteryLevel", N_("Battery Level"), ""},
244 {EXIF_TAG_COPYRIGHT, "Copyright", N_("Copyright"),
245 N_("Copyright information. In this standard the tag is used to "
246 "indicate both the photographer and editor copyrights. It is "
247 "the copyright notice of the person or organization claiming "
248 "rights to the image. The Interoperability copyright "
249 "statement including date and rights should be written in this "
250 "field; e.g., \"Copyright, John Smith, 19xx. All rights "
251 "reserved.\". In this standard the field records both the "
252 "photographer and editor copyrights, with each recorded in a "
253 "separate part of the statement. When there is a clear "
254 "distinction between the photographer and editor copyrights, "
255 "these are to be written in the order of photographer followed "
256 "by editor copyright, separated by NULL (in this case, "
257 "since the statement also ends with a NULL, there are two NULL "
258 "codes) (see example 1). When only the photographer is given, "
259 "it is terminated by one NULL code (see example 2). When only "
260 "the editor copyright is given, "
261 "the photographer copyright part consists of one space followed "
262 "by a terminating NULL code, then the editor copyright is given "
263 "(see example 3). When the field is left blank, it is treated "
265 {EXIF_TAG_EXPOSURE_TIME, "ExposureTime", N_("Exposure Time"),
266 N_("Exposure time, given in seconds (sec).")},
267 {EXIF_TAG_FNUMBER, "FNumber", "FNumber",
268 N_("The F number.")},
269 {EXIF_TAG_IPTC_NAA, "IPTC/NAA", "IPTC/NAA", ""},
270 {EXIF_TAG_IMAGE_RESOURCES, "ImageResources", N_("Image Resources Block"), ""},
271 {EXIF_TAG_EXIF_IFD_POINTER, "ExifIFDPointer", "ExifIFDPointer",
272 N_("A pointer to the Exif IFD. Interoperability, Exif IFD has the "
273 "same structure as that of the IFD specified in TIFF. "
274 "ordinarily, however, it does not contain image data as in "
275 "the case of TIFF.")},
276 {EXIF_TAG_INTER_COLOR_PROFILE, "InterColorProfile",
277 "InterColorProfile", ""},
278 {EXIF_TAG_EXPOSURE_PROGRAM, "ExposureProgram", "ExposureProgram",
279 N_("The class of the program used by the camera to set exposure "
280 "when the picture is taken.")},
281 {EXIF_TAG_SPECTRAL_SENSITIVITY, "SpectralSensitivity",
282 N_("Spectral Sensitivity"),
283 N_("Indicates the spectral sensitivity of each channel of the "
284 "camera used. The tag value is an ASCII string compatible "
285 "with the standard developed by the ASTM Technical committee.")},
286 {EXIF_TAG_GPS_INFO_IFD_POINTER, "GPSInfoIFDPointer",
288 N_("A pointer to the GPS Info IFD. The "
289 "Interoperability structure of the GPS Info IFD, like that of "
290 "Exif IFD, has no image data.")},
292 {EXIF_TAG_GPS_VERSION_ID, "GPSVersionID", "",
293 N_("Indicates the version of <GPSInfoIFD>. The version is given "
294 "as 2.0.0.0. This tag is mandatory when <GPSInfo> tag is "
295 "present. (Note: The <GPSVersionID tag is given in bytes, "
296 "unlike the <ExifVersion> tag. When the version is "
297 "2.0.0.0, the tag value is 02000000.H).")},
298 {EXIF_TAG_GPS_LATITUDE_REF, "GPSLatitudeRef", ""
299 N_("Indicates whether the latitude is north or south latitude. The "
300 "ASCII value 'N' indicates north latitude, and 'S' is south "
302 {EXIF_TAG_GPS_LATITUDE, "GPSLatitude", ""
303 N_("Indicates the latitude. The latitude is expressed as three "
304 "RATIONAL values giving the degrees, minutes, and seconds, "
305 "respectively. When degrees, minutes and seconds are expressed, "
306 "the format is dd/1,mm/1,ss/1. When degrees and minutes are used "
307 "and, for example, fractions of minutes are given up to two "
308 "two decimal places, the format is dd/1,mmmm/100,0/1.")},
309 {EXIF_TAG_GPS_LONGITUDE_REF, "GPSLongitudeRef", ""
310 N_("Indicates whether the longitude is east or west longitude. "
311 "ASCII 'E' indicates east longitude, and 'W' is west "
313 {EXIF_TAG_GPS_LONGITUDE, "GPSLongitude", ""
314 N_("Indicates the longitude. The longitude is expressed as three "
315 "RATIONAL values giving the degrees, minutes, and seconds, "
316 "respectively. When degrees, minutes and seconds are expressed, "
317 "the format is ddd/1,mm/1,ss/1. When degrees and minutes are "
318 "used and, for example, fractions of minutes are given up to "
319 "two decimal places, the format is ddd/1,mmmm/100,0/1.")},
321 {EXIF_TAG_ISO_SPEED_RATINGS, "ISOSpeedRatings",
322 N_("ISO Speed Ratings"),
323 N_("Indicates the ISO Speed and ISO Latitude of the camera or "
324 "input device as specified in ISO 12232.")},
325 {EXIF_TAG_OECF, "OECF", "OECF",
326 N_("Indicates the Opto-Electoric Conversion Function (OECF) "
327 "specified in ISO 14524. <OECF> is the relationship between "
328 "the camera optical input and the image values.")},
329 {EXIF_TAG_EXIF_VERSION, "ExifVersion", N_("Exif Version"),
330 N_("The version of this standard supported. Nonexistence of this "
331 "field is taken to mean nonconformance to the standard.")},
332 {EXIF_TAG_DATE_TIME_ORIGINAL, "DateTimeOriginal",
333 N_("Date and Time (original)"),
334 N_("The date and time when the original image data was generated. "
335 "For a digital still camera "
336 "the date and time the picture was taken are recorded.")},
337 {EXIF_TAG_DATE_TIME_DIGITIZED, "DateTimeDigitized",
338 N_("Date and Time (digitized)"),
339 N_("The date and time when the image was stored as digital data. ")},
340 {EXIF_TAG_COMPONENTS_CONFIGURATION, "ComponentsConfiguration",
341 "ComponentsConfiguration",
342 N_("Information specific to compressed data. The channels of "
343 "each component are arranged in order from the 1st "
344 "component to the 4th. For uncompressed data the data "
345 "arrangement is given in the <PhotometricInterpretation> tag. "
346 "However, since <PhotometricInterpretation> can only "
347 "express the order of Y, Cb and Cr, this tag is provided "
348 "for cases when compressed data uses components other than "
349 "Y, Cb, and Cr and to enable support of other sequences.")},
350 {EXIF_TAG_COMPRESSED_BITS_PER_PIXEL, "CompressedBitsPerPixel",
351 N_("Compressed Bits per Pixel"),
352 N_("Information specific to compressed data. The compression mode "
353 "used for a compressed image is indicated in unit bits "
355 {EXIF_TAG_SHUTTER_SPEED_VALUE, "ShutterSpeedValue", N_("Shutter speed"),
356 N_("Shutter speed. The unit is the APEX (Additive System of "
357 "Photographic Exposure) setting (see Appendix C).")},
358 {EXIF_TAG_APERTURE_VALUE, "ApertureValue", N_("Aperture"),
359 N_("The lens aperture. The unit is the APEX value.")},
360 {EXIF_TAG_BRIGHTNESS_VALUE, "BrightnessValue", N_("Brightness"),
361 N_("The value of brightness. The unit is the APEX value. "
362 "Ordinarily it is given in the range of -99.99 to 99.99.")},
363 {EXIF_TAG_EXPOSURE_BIAS_VALUE, "ExposureBiasValue",
365 N_("The exposure bias. The units is the APEX value. Ordinarily "
366 "it is given in the range of -99.99 to 99.99.")},
367 {EXIF_TAG_MAX_APERTURE_VALUE, "MaxApertureValue", "MaxApertureValue",
368 N_("The smallest F number of the lens. The unit is the APEX value. "
369 "Ordinarily it is given in the range of 00.00 to 99.99, "
370 "but it is not limited to this range.")},
371 {EXIF_TAG_SUBJECT_DISTANCE, "SubjectDistance",
372 N_("Subject Distance"),
373 N_("The distance to the subject, given in meters.")},
374 {EXIF_TAG_METERING_MODE, "MeteringMode", N_("Metering Mode"),
375 N_("The metering mode.")},
376 {EXIF_TAG_LIGHT_SOURCE, "LightSource", N_("Light Source"),
377 N_("The kind of light source.")},
378 {EXIF_TAG_FLASH, "Flash", N_("Flash"),
379 N_("This tag is recorded when an image is taken using a strobe "
381 {EXIF_TAG_FOCAL_LENGTH, "FocalLength", N_("Focal Length"),
382 N_("The actual focal length of the lens, in mm. Conversion is not "
383 "made to the focal length of a 35 mm film camera.")},
384 {EXIF_TAG_MAKER_NOTE, "MakerNote", N_("Maker Note"),
385 N_("A tag for manufacturers of Exif writers to record any desired "
386 "information. The contents are up to the manufacturer.")},
387 {EXIF_TAG_USER_COMMENT, "UserComment", N_("User Comment"),
388 N_("A tag for Exif users to write keywords or comments on the image "
389 "besides those in <ImageDescription>, and without the "
390 "character code limitations of the <ImageDescription> tag. The "
391 "character code used in the <UserComment> tag is identified "
392 "based on an ID code in a fixed 8-byte area at the start of "
393 "the tag data area. The unused portion of the area is padded "
394 "with NULL (\"00.h\"). ID codes are assigned by means of "
395 "registration. The designation method and references for each "
396 "character code are given in Table 6. The value of CountN "
397 "is determinated based on the 8 bytes in the character code "
398 "area and the number of bytes in the user comment part. Since "
399 "the TYPE is not ASCII, NULL termination is not necessary "
401 "The ID code for the <UserComment> area may be a Defined code "
402 "such as JIS or ASCII, or may be Undefined. The Undefined name "
403 "is UndefinedText, and the ID code is filled with 8 bytes of all "
404 "\"NULL\" (\"00.H\"). An Exif reader that reads the "
405 "<UserComment> tag must have a function for determining the "
406 "ID code. This function is not required in Exif readers that "
407 "do not use the <UserComment> tag (see Table 7). "
408 "When a <UserComment> area is set aside, it is recommended that "
409 "the ID code be ASCII and that the following user comment "
410 "part be filled with blank characters [20.H].")},
411 {EXIF_TAG_SUB_SEC_TIME, "SubsecTime", "SubsecTime",
412 N_("A tag used to record fractions of seconds for the "
414 {EXIF_TAG_SUB_SEC_TIME_ORIGINAL, "SubSecTimeOriginal",
415 "SubSecTimeOriginal",
416 N_("A tag used to record fractions of seconds for the "
417 "<DateTimeOriginal> tag.")},
418 {EXIF_TAG_SUB_SEC_TIME_DIGITIZED, "SubSecTimeDigitized",
419 "SubSecTimeDigitized",
420 N_("A tag used to record fractions of seconds for the "
421 "<DateTimeDigitized> tag.")},
422 {EXIF_TAG_FLASH_PIX_VERSION, "FlashPixVersion", "FlashPixVersion",
423 N_("The FlashPix format version supported by a FPXR file.")},
424 {EXIF_TAG_COLOR_SPACE, "ColorSpace", N_("Color Space"),
425 N_("The color space information tag is always "
426 "recorded as the color space specifier. Normally sRGB (=1) "
427 "is used to define the color space based on the PC monitor "
428 "conditions and environment. If a color space other than "
429 "sRGB is used, Uncalibrated (=FFFF.H) is set. Image data "
430 "recorded as Uncalibrated can be treated as sRGB when it is "
431 "converted to FlashPix. On sRGB see Appendix E.")},
432 {EXIF_TAG_PIXEL_X_DIMENSION, "PixelXDimension", "PixelXDimension",
433 N_("Information specific to compressed data. When a "
434 "compressed file is recorded, the valid width of the "
435 "meaningful image must be recorded in this tag, whether or "
436 "not there is padding data or a restart marker. This tag "
437 "should not exist in an uncompressed file. For details see "
438 "section 2.8.1 and Appendix F.")},
439 {EXIF_TAG_PIXEL_Y_DIMENSION, "PixelYDimension", "PixelYDimension",
440 N_("Information specific to compressed data. When a compressed "
441 "file is recorded, the valid height of the meaningful image "
442 "must be recorded in this tag, whether or not there is padding "
443 "data or a restart marker. This tag should not exist in an "
444 "uncompressed file. For details see section 2.8.1 and Appendix "
445 "F. Since data padding is unnecessary in the vertical direction, "
446 "the number of lines recorded in this valid image height tag "
447 "will in fact be the same as that recorded in the SOF.")},
448 {EXIF_TAG_RELATED_SOUND_FILE, "RelatedSoundFile",
450 N_("This tag is used to record the name of an audio file related "
451 "to the image data. The only relational information "
452 "recorded here is the Exif audio file name and extension (an "
453 "ASCII string consisting of 8 characters + '.' + 3 "
454 "characters). The path is not recorded. Stipulations on audio "
455 "are given in section 3.6.3. File naming conventions are "
456 "given in section 3.7.1. "
457 "When using this tag, audio files must be recorded in "
458 "conformance to the Exif audio format. Writers are also allowed "
459 "to store the data such as Audio within APP2 as FlashPix "
460 "extension stream data. "
461 "Audio files must be recorded in conformance to the Exif audio "
462 "format. The mapping of Exif image files and audio files is done "
463 "in any of the three ways shown in Table 8. If multiple files "
464 "are mapped to one file as in [2] or [3] of this table, the above "
465 "format is used to record just one audio file name. If "
466 "there are multiple audio files, the first recorded file is "
467 "given. In the case of [3] in Table 8, for example, for the "
468 "Exif image file \"DSC00001.JPG\" only \"SND00001.WAV\" is "
469 "given as the related Exif audio file. When there are three "
470 "Exif audio files \"SND00001.WAV\", \"SND00002.WAV\" and "
471 "\"SND00003.WAV\", the Exif image file name for each of them, "
472 "\"DSC00001.JPG\", is indicated. By combining multiple "
473 "relational information, a variety of playback possibilities "
474 "can be supported. The method of using relational information "
475 "is left to the implementation on the playback side. Since this "
476 "information is an ASCII character string, it is terminated by "
477 "NULL. When this tag is used to map audio files, the relation "
478 "of the audio file to image data must also be indicated on the "
480 {EXIF_TAG_INTEROPERABILITY_IFD_POINTER, "InteroperabilityIFDPointer",
481 "InteroperabilityIFDPointer",
482 N_("Interoperability IFD is composed of tags which stores the "
483 "information to ensure the Interoperability and pointed "
484 "by the following tag located in Exif IFD. "
485 "The Interoperability structure of Interoperability IFD is "
486 "the same as TIFF defined IFD structure "
487 "but does not contain the "
488 "image data characteristically compared with normal TIFF "
490 {EXIF_TAG_FLASH_ENERGY, "FlashEnergy", N_("Flash Energy"),
491 N_("Indicates the strobe energy at the time the image is "
492 "captured, as measured in Beam Candle Power Seconds (BCPS).")},
493 {EXIF_TAG_SPATIAL_FREQUENCY_RESPONSE, "SpatialFrequencyResponse",
494 N_("Spatial Frequency Response"),
495 N_("This tag records the camera or input device spatial frequency "
496 "table and SFR values in the direction of image width, "
497 "image height, and diagonal direction, as specified in ISO "
499 {EXIF_TAG_FOCAL_PLANE_X_RESOLUTION, "FocalPlaneXResolution",
500 N_("Focal Plane x-Resolution"),
501 N_("Indicates the number of pixels in the image width (X) direction "
502 "per <FocalPlaneResolutionUnit> on the camera focal plane.")},
503 {EXIF_TAG_FOCAL_PLANE_Y_RESOLUTION, "FocalPlaneYResolution",
504 N_("Focal Plane y-Resolution"),
505 N_("Indicates the number of pixels in the image height (V) direction "
506 "per <FocalPlaneResolutionUnit> on the camera focal plane.")},
507 {EXIF_TAG_FOCAL_PLANE_RESOLUTION_UNIT, "FocalPlaneResolutionUnit",
508 N_("Focal Plane Resolution Unit"),
509 N_("Indicates the unit for measuring <FocalPlaneXResolution> and "
510 "<FocalPlaneYResolution>. This value is the same as the "
511 "<ResolutionUnit>.")},
512 {EXIF_TAG_SUBJECT_LOCATION, "SubjectLocation",
513 N_("Subject Location"),
514 N_("Indicates the location of the main subject in the scene. The "
515 "value of this tag represents the pixel at the center of the "
516 "main subject relative to the left edge, prior to rotation "
517 "processing as per the <Rotation> tag. The first value "
518 "indicates the X column number and second indicates "
519 "the Y row number.")},
520 {EXIF_TAG_EXPOSURE_INDEX, "ExposureIndex", N_("Exposure index"),
521 N_("Indicates the exposure index selected on the camera or "
522 "input device at the time the image is captured.")},
523 {EXIF_TAG_SENSING_METHOD, "SensingMethod", N_("Sensing Method"),
524 N_("Indicates the image sensor type on the camera or input "
526 {EXIF_TAG_FILE_SOURCE, "FileSource", N_("File Source"),
527 N_("Indicates the image source. If a DSC recorded the image, "
528 "this tag value of this tag always be set to 3, indicating "
529 "that the image was recorded on a DSC.")},
530 {EXIF_TAG_SCENE_TYPE, "SceneType", N_("Scene Type"),
531 N_("Indicates the type of scene. If a DSC recorded the image, "
532 "this tag value must always be set to 1, indicating that the "
533 "image was directly photographed.")},
534 {EXIF_TAG_NEW_CFA_PATTERN, "CFAPattern",
536 N_("Indicates the color filter array (CFA) geometric pattern of the "
537 "image sensor when a one-chip color area sensor is used. "
538 "It does not apply to all sensing methods.")},
539 {EXIF_TAG_SUBJECT_AREA, "SubjectArea", N_("Subject Area"),
540 N_("This tag indicates the location and area of the main subject "
541 "in the overall scene.")},
542 {EXIF_TAG_TIFF_EP_STANDARD_ID, "TIFF/EPStandardID", N_("TIFF/EP Standard ID"), ""},
543 {EXIF_TAG_CUSTOM_RENDERED, "CustomRendered", N_("Custom Rendered"),
544 N_("This tag indicates the use of special processing on image "
545 "data, such as rendering geared to output. When special "
546 "processing is performed, the reader is expected to disable "
547 "or minimize any further processing.")},
548 {EXIF_TAG_EXPOSURE_MODE, "ExposureMode", N_("Exposure Mode"),
549 N_("This tag indicates the exposure mode set when the image was "
550 "shot. In auto-bracketing mode, the camera shoots a series of "
551 "frames of the same scene at different exposure settings.")},
552 {EXIF_TAG_WHITE_BALANCE, "WhiteBalance", N_("White Balance"),
553 N_("This tag indicates the white balance mode set when the image "
555 {EXIF_TAG_DIGITAL_ZOOM_RATIO, "DigitalZoomRatio",
556 N_("Digital Zoom Ratio"),
557 N_("This tag indicates the digital zoom ratio when the image was "
558 "shot. If the numerator of the recorded value is 0, this "
559 "indicates that digital zoom was not used.")},
560 {EXIF_TAG_FOCAL_LENGTH_IN_35MM_FILM, "FocalLengthIn35mmFilm",
561 N_("Focal Length In 35mm Film"),
562 N_("This tag indicates the equivalent focal length assuming a "
563 "35mm film camera, in mm. A value of 0 means the focal "
564 "length is unknown. Note that this tag differs from the "
565 "FocalLength tag.")},
566 {EXIF_TAG_SCENE_CAPTURE_TYPE, "SceneCaptureType",
567 N_("Scene Capture Type"),
568 N_("This tag indicates the type of scene that was shot. It can "
569 "also be used to record the mode in which the image was "
570 "shot. Note that this differs from the scene type "
571 "(SceneType) tag.")},
572 {EXIF_TAG_GAIN_CONTROL, "GainControl", N_("Gain Control"),
573 N_("This tag indicates the degree of overall image gain "
575 {EXIF_TAG_CONTRAST, "Contrast", N_("Contrast"),
576 N_("This tag indicates the direction of contrast processing "
577 "applied by the camera when the image was shot.")},
578 {EXIF_TAG_SATURATION, "Saturation", N_("Saturation"),
579 N_("This tag indicates the direction of saturation processing "
580 "applied by the camera when the image was shot.")},
581 {EXIF_TAG_SHARPNESS, "Sharpness", N_("Sharpness"),
582 N_("This tag indicates the direction of sharpness processing "
583 "applied by the camera when the image was shot.")},
584 {EXIF_TAG_DEVICE_SETTING_DESCRIPTION, "DeviceSettingDescription",
585 N_("Device Setting Description"),
586 N_("This tag indicates information on the picture-taking "
587 "conditions of a particular camera model. The tag is used "
588 "only to indicate the picture-taking conditions in the "
590 {EXIF_TAG_SUBJECT_DISTANCE_RANGE, "SubjectDistanceRange",
591 N_("Subject Distance Range"),
592 N_("This tag indicates the distance to the subject.")},
593 {EXIF_TAG_IMAGE_UNIQUE_ID, "ImageUniqueID", N_("Image Unique ID"),
594 N_("This tag indicates an identifier assigned uniquely to "
595 "each image. It is recorded as an ASCII string equivalent "
596 "to hexadecimal notation and 128-bit fixed length.")},
597 {0, NULL, NULL, NULL}
600 /* For now, do not use these functions. */
601 ExifTag exif_tag_table_get_tag (unsigned int n);
602 const char *exif_tag_table_get_name (unsigned int n);
603 unsigned int exif_tag_table_count (void);
606 exif_tag_table_get_tag (unsigned int n)
608 return (n < exif_tag_table_count ()) ? ExifTagTable[n].tag : 0;
612 exif_tag_table_get_name (unsigned int n)
614 return (n < exif_tag_table_count ()) ? ExifTagTable[n].name : NULL;
618 exif_tag_table_count (void)
620 return sizeof (ExifTagTable) / sizeof (ExifTagTable[0]);
624 exif_tag_get_name (ExifTag tag)
628 for (i = 0; ExifTagTable[i].name; i++)
629 if (ExifTagTable[i].tag == tag)
632 return ExifTagTable[i].name;
636 exif_tag_get_title (ExifTag tag)
640 bind_textdomain_codeset (GETTEXT_PACKAGE, "UTF-8");
641 bindtextdomain (GETTEXT_PACKAGE, LIBEXIF_LOCALEDIR);
643 for (i = 0; ExifTagTable[i].title; i++)
644 if (ExifTagTable[i].tag == tag) break;
645 return _(ExifTagTable[i].title);
649 exif_tag_get_description (ExifTag tag)
653 bind_textdomain_codeset (GETTEXT_PACKAGE, "UTF-8");
654 bindtextdomain (GETTEXT_PACKAGE, LIBEXIF_LOCALEDIR);
656 for (i = 0; ExifTagTable[i].description; i++)
657 if (ExifTagTable[i].tag == tag) break;
658 return _(ExifTagTable[i].description);
662 exif_tag_from_name (const char *name)
668 for (i = 0; ExifTagTable[i].name; i++)
669 if (!strcmp (ExifTagTable[i].name, name)) break;
670 return ExifTagTable[i].tag;