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Is it just the subsampling? Naively i would assume that even if you have the unnessary the C_b C_r channels in a greyscale image, they are going to compress re
by bawolff 2y ago
Is it just the subsampling?
Naively i would assume that even if you have the unnessary the C_b C_r channels in a greyscale image, they are going to compress really well since they have very little information in a greyscale image.
- wmil 2y agoJPEG / JFIF isn't really smart enough to take advantage of that. It's a file format from 1992, CPU speed was limited.
- bawolff 2y agoJPEG does entropy encoding.
- plorkyeran 2y agoStoring photos and sufficiently photo-like images as YCbCr rather than RBG does indeed tend to make them more compressible even without subsampling.