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by grishka
1680 days ago
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Dithering would, in theory, work well for compression if you use a palette. GIF always does that, PNG also has a palette mode. JPEG, WebP, and AVIF use various frequency-domain transforms. These work best for smooth color transitions, like in photos. They're generally terrible for sharp edges (as found on screenshots), and especially so when many neighboring pixels have drastically different colors. |
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Even then that's a bit more complicated because both formats will apply LZ compression (respectively LZW and LZ77 because DEFLATE), so depending on the original source the dithering can work against the compression.