RGB filtering
From The Glossary of Digital Photography
Red, green, and blue filters applied to grayscale (sometimes called black-and-white) pixels. This application changes the image in a CCD image sensor from grayscale to color.

ONLINE GLOSSARY OF DIGITAL PHOTOGRAPY
Red, green, and blue filters applied to grayscale (sometimes called black-and-white) pixels. This application changes the image in a CCD image sensor from grayscale to color.