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It does kind of matter, because compression isn't the only form of optimization that can be done. Consider a 32 bit png that is actually bilevel with no transpa
by HeyImAlex 11y ago
It does kind of matter, because compression isn't the only form of optimization that can be done. Consider a 32 bit png that is actually bilevel with no transparency. If zopfli just recompresses, PNGOut will still make smaller output because it does bit depth reductions.
- danielvf 11y agoThe zopfliPNG program does do bit depth reduction if that's possible. It even tests to see if a given small image that would be possible to bit depth reduce would actually be smaller by it keeping 32 bit, since the added pallet overhead may cost more than the gain of a smaller pixel storage cost.