But they do not provide SSIM comparisons, they compare PSNR. Here is "how to cheat with codec comparisons", http://x264dev.multimedia.cx/?p=472 http://x264dev.

But they do not provide SSIM comparisons, they compare PSNR. Here is "how to cheat with codec comparisons", http://x264dev.multimedia.cx/?p=472 http://x264dev.multimedia.cx/?p=472 which exaplains (partially) why PSNR isn't that great when judging image quality. SSIM: http://en.wikipedia.org/wiki/Structural_similarity http://en.wikipedia.org/wiki/Structural_similarity