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improved png compression ratio (ticket #1452)

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This commit is contained in:
Vadim Pisarevsky 2011-10-28 02:22:11 +00:00
parent 3f22a1c40f
commit 17c3102705
1 changed files with 1 additions and 1 deletions
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2
modules/highgui/src/grfmt_png.cpp
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@ -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 :