There is a node for materials that allows for hue shifting of colors.
And although it works great for materials, it can’t be used in things like lights and fog. In this scene I wanted to shift the color of the crystals and mushrooms just slightly from their original color.
While you could fake it by multiplying each RGB Value with a random float, it could come up with a very strange colors from the original because it can change the saturation.
Another approach is to convert RGB to YIQ which will allow for hue shift based upon a degree offset just like a color wheel. For each crystal actor in the scene the pink color is shifted between -10 and 10 degrees on the YIQ color wheel and then converted back to RGB to use for light and material color.
If the main color is close to red, blue, or green, the math works just fine. If the main color is closer to yellow, magenta, or cyan the offset will need to be larger to see results. This is the artistic side of this algorithm that I have not fully worked out yet since it is a little based on preference. Those Adobe programmers really have it nailed.
Would you like to see a tool like this in the marketplace?