I know about the FLAC files. I myself do not use them. I mostly listen to Redbook CD's and LP's. Yes LPs. When I listen to wireless streaming music from my computer to my main stereo only system I usually listen to AIFF files.The whole process of listening to high definition streaming data is still in a somewhat transitional phase. I can't imagine that there are not similar issues and concerns with digital image files.
There are issues with digital image files but they do not involve lossless compression which is, well, lossless. It seems like you avoid anything with the word compression in it - as if it were a dbx product or something . If you can tell any difference between uncompressed and codec'd file format X, the that file format is not lossless, period. If someone calls it lossless and you can prove you can detect a difference, they are wrong - or lying.