Color Temperature Wikipedia

Color correction - Wikipedia.

Color correction is a process used in stage lighting, photography, television, cinematography, and other disciplines, which uses color gels, or filters, to alter the overall color of the light.Typically the light color is measured on a scale known as color temperature, as well as along a light yellow -light blue axis orthogonal to the color temperature axis..

https://en.wikipedia.org/wiki/Color_correction.