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No, there are 4:4:4 and 4:2:2 modes in JPEG. H.264 also defines such modes, but no consumer hardware decoders support them so they aren't commonly used.
by brigade 12y ago
No, there are 4:4:4 and 4:2:2 modes in JPEG.
H.264 also defines such modes, but no consumer hardware decoders support them so they aren't commonly used.
- mikeash 12y agoMy mistake, I must have been going off what's common versus what's allowed. Thanks for pointing it out.
- dunham 12y agoApple's jpeg animation hack used 4:4:4 so the blocks wouldn't interfere with each other. It's a neat hack, worth reading about if you haven't seen it yet: https://docs.google.com/document/pub?id=1GWTMLjqQsQS45FWwqNG9ztQTdGF48hQYpjQHR_d1WsI https://docs.google.com/document/pub?id=1GWTMLjqQsQS45FWwqNG...
- mikeash 12y agoHoly moly. What a hack.