> I have a couple of fundamental issues with how you're calculating 3 of the 4 > metrics (all but RGB-SSIM, which I didn't think too much about)
You are right about it, methodology is not clear on this point. > First, am I correct in my reading of your methodology that for all metrics, > you encode a color image (4:2:0) and use that encoded filesize? All metrics compute data on *decoded* data, being RGB or YUV. Maybe authors could publish a flow of their methodology, that would ease the discussion. > Fortunately, the solution is easy - for greyscale metrics, simply convert to > greyscale before encoding, not after. Or, if that's what you're already > doing, make it clear. As I already said, it's not really a good idea to use luma-only metrics to assess colored image, as coders tend to blend colors as the quality index decreases. _______________________________________________ dev-platform mailing list dev-platform@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-platform
