Welcome to TVPaint Community forums !

i'm looking for a way to make the Lighting FX non destructive,
by applying the spotlights of the FX to a static single color frame and setting this layer to a suitable blend mode.

This is so i don't have to reapply the lightning FX if there are later changes to the colors of a shot.
The idea is that this saves me having to find,load and apply the appropriate lightning FX bin for the shot for each color correction.
(all of this wouldn't be needed if only TVPaint would be able to save multiple fxstacks within its project file!!!)


Now i have difficulties to match the result of this approach with the result of the lighting FX.
it looks close but not quite there.
i'm applying the lights to a 127 grey color and using blendmode Overlay2.

Does anyone have suggestions or can offer more insight as to what what the spotlight FX does exactly, or what else i could try?

The best way for using an FX without making it destructive is to add the FX image source before the FX lighting in the stack and apply it on a new layer.
That way, if you want to change the color, you can simply disable or suppress the previous applied layer and apply it again on a new layer.