PaulRB:
To get the standard 7 colours (or black) you would simply send the same pattern to some combination of the R, G & B pins:R only: Red
G only: Green
B only: Blue
R & G pins: Yellow
R & B pins: Magenta (purple)
G & B pins: Cyan (turquoise)
R & G & B pins: White
Aaaa sorry i misunderstood your anwser about color mixing. I was asking about color brightness. But i see now that you need PWM as you wrote for setting color brightness. Will try to edit rgbmatrix library because i can see that only rows are shifted different way than on the original module.