I created a new branch “enhance_icc” for the problems mentioned above
For the ICC V4, I deleted the display of v4 files (RTv4) for ICC used for the screen (in Preferences “default profile monitor”) because I think there is incompatibility (of course to check later).
I think also, for this type of profile (monitor display) that ICCV4 bring nothing - at least for this type of profiles
I thought a lot about the color gamut problem (OOG) between AdobeRGB1998 and RTv2_Medium, effectivly there are differences in some cases.
Now with modifications, the behavior seems to me identical, the main modification is the replacement of the gamma sRGB (g=2.4 s=12.92) by a simple gamma = 2.2, but also by changing the way it is calculated (gamma 2.2).
I change the code inside the “ICC Profile Creator”, but it does not affect the interface.
Before this modification, all profiles furnished (RTv2 or RTv4) were all by default with a “sRGB gamma”. Now RTv2_Medium and RTv4_medium are with gamma=2.2
Of course you can change these values with the “ICC profile creator”.
More complete explanations will be provided shortly, in the issue that I will open (probably tomorrow).
I am open to any proposal to improve Wikipedia, but my low level of English will be a handicap…
Color Management is not easy, with a lot of empiricism and approximation (Ciecam, gamut, Munsell correction, Lab, ICC, etc.), but some progamming solutions work better than others, here again I can contribute if I am told what to do.