Color Correction - Nuke 101: Professional Compositing and Visual Effects - page 147

Color correction is one of the most fundamental things you can do to an image. It
refers to any change to the perceived color of an image. Making an image lighter,
more saturated, changing the contrast, making it bluer—all of this is color correc-
tion.Therearealotofusesforcolorcorrection.Themostobviousoneistomakean
image look different as a result of a stylistic decision. But you can also color correct
to combine two images so they feel like part of the same scene. This is performed of-
tenincompositingwhentheforegroundandthebackgroundshouldhavecolorsthat
work well together. There are plenty more uses for changing the color of an image. An
image might be a mask or an alpha channel that needs to have a different color in some
way—to lose softness and give it more contrast, for example.
Whatever reason you have for color correcting an image, the color correction will work
according to the way Nuke handles color. Nuke is a very advanced system that uses
cutting-edge technology and theory to work with color. It is important to understand
Nuke's approach to color to understand color correcting within Nuke.