I just got Kill Color working, which can remove a targeted color from an image without altering it in any other way. It preserves Value while removing a targeted Hue. It needs lots more features before it will be very useful but it works! (Its Alive!)
It will be able to remove a targeted color, replace a color, color to alpha, some basic color targeted HSL transforms, and what ever else I can dream up. It will defiantly have green screen like abilities, but I will probable make a separate plugin more dedicated towards green screening after I release this one.
see bellow for some early examples of it capabilities!
distracting backgrounds are easily removed. the blue that was reflected in her eyes and teeth were also removed, no traces are left of targeted colors. image source
and just a little more touch up to remove the yellow bounce light from her face. In this case not all yellow was removed, just enough.
note that the “blue” that is left is actually magenta a critical distinction. image source
delicate color blends are preserved, and look just as they did in the original image. image source