HSV
In case anyone didn't get this. Here is how I changed the value of a
color in script-fu. You could do something similar for Saturation and I
guess hue, not sure though it would create the desired effect if you
played with the hue.
;;sphere-color is a color
;;light-i will be the new color
;;light-intensity is the new value (HSV)
(set! light-i (list (* (car sphere-color) light-intensity) ;;Red
(* (cadr sphere-color) light-intensity) ;;Green
(* (caddr sphere-color) light-intensity) )) ;;Blue
(gimp-context-set-background light-i)
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