I've had a few projects now, where I would like the pixel map to only affect the intensity, so I can use colour palettes to mix the colour- the reason being, that for fixtures that have more colour parameters then RGBW, I can't achieve the same depth of colour or subtlety from the pixel map engine- particularly if I want to match the pixel mapped fixtures to other fixtures being used onstage.
So I think it would be a 'luma' pixel map where just the intensity data is taken from the image / video- which I'll often make to be sync'd perfectly with sound for example.
