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IMO the linked study is pretty much useless, because of enforced 4:2:0 chroma subsampling. I guess this is because some of the newer codecs were originally vide
by pdknsk 12y ago
IMO the linked study is pretty much useless, because of enforced 4:2:0 chroma subsampling. I guess this is because some of the newer codecs were originally video codecs where 4:2:0 is standard, but for still images I expect much better. Photoshop, which is obviously widely used on the desktop to make JPEGs, only uses 4:2:0 for quality <= 50 by default.
This also makes me question the use of metrics to measure image quality.
- kevingadd 12y agoI don't think it would make sense to compare some codecs at 4:2:0 and some at 4:4:4. Unless they can all do 4:4:4, you have to pick a subsampling that they can all do and compare them at that so it's like-for-like. If your goal is to demonstrate 'JPEG can deliver better quality than this format by using 4:4:4, because that format can't do 4:4:4', then that's great, but it's a different observation than the one they're trying to make. (Also, I would be pretty curious about whether the different subsampling produces superior file sizes.)