hey guys i think i found very great article about this. try read and try this algorithm. paint.net and photoshop cs6 fail to scale gamma image.
check this out
http://www.4p8.com/eric.brasseur/gamma.html
i think i found a good tools to resample image
http://svn.int64.org/viewvc/int64/resamplehq/doc/index.html
resampleHQ. it's opensource from avisynth project but i dont know how to run this lib :3
cannot find exe file :3