I just looked at the code for Gimp's png plugin to see if it had any support for gamma. There is no gamma support when loading png images even though this should be easy with the gimp_levels function. Saving a png is strange. It does allow saving the gamma value, however, if the gamma reported by Gimp is 1.0 then it uses a default of 2.2 which messes up the use of gamma. This really needs to be fixed.
posted by TechnoMage at 5:22 PM LINK