07-20-2017, 12:20 AM
AFAIK Gimp 2.8 (which is limited to 8-bit precision works in "perceptual mode" which include Gamma. The next version (2.10, once finalized, but right now you can use 2.9.5, the "developer" version, if you are brave enough) can work on 8/16/32 bit, and in both linear or perceptual light. You may also find Elle Stone's variant to your liking,