Just read in KDP guide that Amazon only supports GIF and JPG,
and all PNGs are converted to JPG in the upload process... which means those images will lose their transparent background, and it will become WHITE. So the only way to preserve transparency is to use GIF.... so all the time spent converting the PSDs over again into PNG was wasted (originally made GIFs then read PNGs are superior), and now have to create all new GIFs again and then replace them in Sigil... Again...
(Yes, I saved the original GIFs but as I made the PNGs I added effects in PSD to each image that I want in the GIFs, so...)
If they are only going to support one format that includes transparency, why the old, outdated, one? The PNGs created from the PSDs were superior to the GIFs and also compressed to be slightly smaller, still looking better.
Meanwhile, GIF
will continue to include transparency once uploaded to Amzn, right? I mean, internal images in eBooks can include transparency, correct?
EDIT: OK, it seems Amazon changed things up at the end of 2015 and since then all images are converted to JPEG XR, including GIFs. When they started doing this GIFs lost their transparency too, even though this newer JPEG XR format supports transparency (unlike normal JPEG). Then apparently Amazon claimed they were going to fix that.
(source) So does anyone know if they have? Are currently uploaded GIFs converted to JPEG XR with transparency intact?