Bob Chorley

You can use the Colour Matrix operator - add it between a pair of Colour Space operators so your stack looks like this: [Colour Space (Convert to RLab)] [Colour Matrix] [Colour Space (Convert to Working Colour Space)] Now you can adjust the mix of channels using the Red, Green and Blue output sliders - remember that the RLab channels map as follows: L - green sliders a - red sliders b - blue sliders You can of course add other operators between the Colour Space convert operators too.