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improved png compression ratio (ticket #1452)
author
Vadim Pisarevsky
<no@email>
Fri, 28 Oct 2011 02:22:11 +0000
(
02:22
+0000)
committer
Vadim Pisarevsky
<no@email>
Fri, 28 Oct 2011 02:22:11 +0000
(
02:22
+0000)
modules/highgui/src/grfmt_png.cpp
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diff --git
a/modules/highgui/src/grfmt_png.cpp
b/modules/highgui/src/grfmt_png.cpp
index
d0e2680
..
045530a
100644
(file)
--- a/
modules/highgui/src/grfmt_png.cpp
+++ b/
modules/highgui/src/grfmt_png.cpp
@@
-366,7
+366,7
@@
bool PngEncoder::write( const Mat& img, const vector<int>& params )
png_set_filter(png_ptr, PNG_FILTER_TYPE_BASE, PNG_FILTER_SUB);
png_set_compression_level(png_ptr, Z_BEST_SPEED);
}
- png_set_compression_strategy(png_ptr, Z_
HUFFMAN_ONLY
);
+ png_set_compression_strategy(png_ptr, Z_
FILTERED
);
png_set_IHDR( png_ptr, info_ptr, width, height, depth == CV_8U ? 8 : 16,
channels == 1 ? PNG_COLOR_TYPE_GRAY :