nomacs : Qt-based image viewer ( https://nomacs.org/ )
pfstools : A set of command line programs for reading, writing and manipulating HDR images ( http://pfstools.sourceforge.net/ )
ufraw : RAW Image format viewer and GIMP plugin ( http://ufraw.sourceforge.net/ )
Add an ebuild in portage :
The ebuild is now in the portage tree.
You can also use layman : emerge layman then layman -a pkalin
For Paludis use this rsync : rsync://gentoo.zugaina.org/pkalin-portage
If you have a problem : ycarus(-at-)zugaina.org