git-svn-id: file:///srv/caca.zoy.org/var/lib/svn/libpipi/trunk@2913 92316355-f0b4-4df1-b90c-862c8a59935f

8-bit per channel picture to float32 then back again does not change
    the image.

git-svn-id: file:///srv/caca.zoy.org/var/lib/svn/libpipi/trunk@2621 92316355-f0b4-4df1-b90c-862c8a59935f