Comment by trinix912

GIMP in my opinion has a very good UI when you're looking at graphics as a programmer: threshold this, clamp that, apply a kernel ("custom filter")... Everything seems to click with a mental model of someone who does graphics programming.

Whereas Photoshop and other "mainstream" software use terms and procedures non-programmers are more likely to be familiar with: heal this area with a patch, clone something with a clone stamp, scissors/lasso to cut something out (not saying GIMP doesn't have those)...