ciantic writes: Almost every web developer would benefit from image format that has the capabilities of JPEG and Alpha Channel like in PNG. But why there is not any? Google is developing WebP but it seems like it does not include this killer feature, and as it is discussed it gets to stand still when engineer asks something specific. What is the main issue here? Clearly web is missing this kind of format. From my naive stand point of view the alpha channel would be just like RGB channels, with slight exception the extreme values of Alpha should not be compressed. If you need examples why such format is needed, there is not shortage of that in web. Common example for this kind of need is tilted Polaroid picture with transparent background, and gradient fading in photographs.