charls : C++ implementation of the JPEG-LS standard ( https://github.com/team-charls/charls )
flif : Free lossless image format library ( https://github.com/FLIF-hub/FLIF )
jxrlib : Open source implementation of the jpegxr image format standard ( https://archive.codeplex.com/?p=jxrlib )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a jm-overlay
For Paludis use this rsync : rsync://gentoo.zugaina.org/jm-overlay-portage
If you have a problem : ycarus(-at-)zugaina.org