Want to give BPG / libbpg a try? Here's a repo for you.
By now, most people will have heard about libbpg. Or maybe rather about the new BPG (better portable graphics) image format that was created by Fabrice Bellard, creator of qemu and ffmpeg, to possibly hopefully replace JPEG (and maybe even PNG) image formats one day.
But since I was playing around with the library anyway, I created a RPM package, just for fun, and created a Fedora COPR repository from it for everyone's profit. Feel free to use this repo/package/software at your own risk and get it by following the instructions at https://copr.fedoraproject.org/coprs/red/libbpg/
Patches to the spec file welcome, but don't expect any kind of support or such.