After multiple discussions in the AgX threads around color rotation, I made a table to link the primaries rotation in rgb primaries and AgX modules to the manipulations you’d have to do in the channel mixer to obtain the same effect. In channel mixer, in order to keep white balance, you have to compensate an increase in one input channel by a reduction of the same value in the primary of the output channel. For example in the Red output channel an increase of 0.3 in the green input channel has to be compensated by a reduction of the red input channel to 0.7. See Boris’ video, episode #81 on rgb primaries module.
I also included the effect the six rotations have on the primaries and secondaries. This should help to decide what rotation to select in order to achieve a desired effect. For example if you want to remove too much yellow in green grass: you can select the Blue to Magenta rotation because this will push Yellow to Green.
Maybe someone can check whether all is correct.
I hope you’ll find this helpful.
Ratation_ChMixer_effect.pdf (40.9 KB)
