Fixes for grey scale reduction - #171
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I assume since this is a proprietary file you wouldn't be able to make a test case out of it. But this seems reasonable. Thanks! |
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Here's a synthetic test file created using |
shssoichiro
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If I understand the color conversion code in lodepng correctly, the RGB values that are represented by 2-bit and 4-bit greyscale in bit depth reduction are wrong.
With the current implementation, oxipng corrupts a proprietary file because it thinks it can be reduced to 2-bit greyscale and quits when it detects that the result is corrupted.