As mark-r says, it's about bandwidth. The movies are not hand-carried to each theater. JP2K is still the leader in visual quality per byte. All DCT-based compr

As mark-r says, it's about bandwidth. The movies are not hand-carried to each theater. JP2K is still the leader in visual quality per byte. All DCT-based compression systems (jpeg, mpeg, dv, etc) are prone to "mosquito noise" artifacts which are extremely annoying in moving pictures since the noise moves around and looks like mosquitos flying about. The usual workaround for mosquitos is to blur the picture a bit to make it easier to compress; but that softens the edges of object onscreen. Wavelet systems like jp2 suffer from different, less annoying, artifacts. gzip'ing 4:2:2 is a terrible idea :-). Keep in mind that Jp2K does have a lossless mode which you can use if you really don't want to lose any quality.