chrōˈminance noun (TV)

The difference between any colour and a reference colour of equal luminance

chrōˈmakey noun (TV)

A special effect in which a coloured background can be removed from a picture and a different background substituted

chromatic aberration noun

The blurring of an optical image, with colouring of the edges, caused by light of different wavelengths being focused at different distances

chromatic adaption noun (botany)

Differences in amount or proportion of photosynthetic pigments in plants in response to the amount and colour of available light

chromaticity co-ordinates plural noun (physics)

Numbers whose values are used to specify a colour

chromaticity diagram noun (physics)

A diagram on which the chromaticity of a colour is plotted

chromatic scale noun (music)

A scale proceeding by semitones