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It would be a great addition a color action that does the same as the colorize tool from Gimp. That's what I first expected from the color shift action, but I think that's not the same effect.
The action should be able to tune the hue, saturation and lightness of the image to achieve an effect like if I'm seeing the image through a colorized plastic plate.
I think this can also be achieved by placing a flat image with the overlay action, but maybe is less-than-optimal?
I might work on this feature if dman not interested.