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pngcrush reads in a PNG image, and writes it out again, with the
optimum filter_type and zlib_level. It uses brute force (trying
filter_type none, and libpng adaptive filtering, with compression
levels 3 and 9). It does the most time-consuming method last in case
it turns out to be the best. Optionally, it can remove unwanted
chunks or add gAMA and sRGB chunks.
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