There are probably a couple of issues here: > - Why didn't you include JPEG 2000?
This is the first one. However, I would also include various settings of the codecs involved. There is quite a bit one can do. For example, the overlap settings for XR or visual weighting for JPEG 2000, or subsampling for JPEG. > - Correct me if I'm wrong but JPEG-XR native color space is not Y'CbCr this > means that this format had to perform an extra (possibly lossy) color space > conversion. The question is whether PSNR was measured in YCbCr space or RGB space. The JPEG measures in RGB, the MPEG in YUV. > - I suppose that the final lossless step used for JPEGs was the usual Huffman > encoding and not arithmetic coding, have you considered testing the later one > independently? Uninteresting since nobody uses it - except a couple of compression gurus, the AC coding option is pretty much unused in the field. > - The image set is some what biased toward outdoor photographic images and > highly contrasted artificial black and white ones, what about fractal > renderings, operating systems and 2D/3D games screen-shots, blurry, out of > frame or night shots? That depends very much on the use case you have. For artificial images, I would suggest not to use JPEG & friends in first place since they depend on natural scene statistics. Anyhow: Here is the JPEG online test which lets you select (many) parameters and measure (many) curves, as much as you want: http://jpegonline.rus.uni-stuttgart.de/index.py This is a cut-down version of the JPEG-internal tests, though using essentially the same tools. Greetings, Thomas _______________________________________________ dev-platform mailing list dev-platform@lists.mozilla.org https://lists.mozilla.org/listinfo/dev-platform
