thanks a lot for your answer , thelegendaryof !
I'll ask as many details as possible to my friend. As you said, difficult to know exactly what to do, when we don't know exactly what are the problems.
What about the game settings, the gamma cursor is at maximum.
When I know all what we need, I will post it here.
i think if you want the add on is usefull for everybody, the best would be to allow them to choose the parameters like colors. But I don't know how much it is difficult, and if it's possible, so I let you judge
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thanks a lot for your help, and I give the other details soon.