chroma key(redirected from Color-separation overlay)
A technique in video and photography editing in which portions of an image containing a preselected color, such as a bluescreen background, are replaced with material from a separate image using an electronic color filter.
[chroma + key, to chromakey; see key1.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.