Hello! > It shouldn't make any difference. > Again, I suspect that the difference will be so small as to be > negligible. Pick one in the middle of what you're likely to edit at. > * should I create additional matrices for different observers (2deg, 10deg)? > I don't know if it will have any future use with Spyder3 So I guess the best approach is to set brightness to intended level and maximize RGB gains. I've read somewhere that 10deg observer provides better match in perceived white balance between WG and normal displays so it's why I'm asking. But on the other hand I don't know whether Spyder is able to use 10deg observer setting. -- Best regards, Darek