Re: Studying Lossy Image Compression Efficiency

2013-10-21 Thread trichter
> I think it would be worthwhile to do two experiments with real people > > evaluating the images: > > 1) For a given file size with artifacts visible, which format > > produces the least terrible artifacts? > > 2) Which format gives the smallest file size with a level of > > artifacts that

Re: Studying Lossy Image Compression Efficiency

2013-10-21 Thread trichter
> Are there now JPEG 2000 encoders that make images such that if you > > want to decode an image in quarter of the full-size in terms of number > > of pixels (both dimensions halved), it is sufficient to use the first > > quarter of the file length? Yes, certainly. Just a matter of the progres

Re: Studying Lossy Image Compression Efficiency

2013-10-21 Thread trichter
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 subsamp