I noticed (quite recently) that when dealing with blending colours, the software must be using the lazy method that goes something like (PixelA+PixelB)/2. which is forgetting that computers essentially square root those colours (It's actually a Γ (Gamma) root), so you are making an average of a square root when it should be the square root of an average. The fix is to do (PixelA^Γ+PixelB^Γ)/2 where Γ (Gamma) is equal to somewhere between 1.8 and 2.2, depending on what took the image and what your monitor settings are. If there is an option for this already, I haven't been able to find it, but it really should be on by default, and it really shouldn't be without the proper mathematics. Minute Physics on Youtube recently made a really great video that explains this better than I did and it was that video that finally convinced me to do this. Anywho, here's a link to that: https://www.youtube.com/watch?v=LKnqECcg6Gw
