In digital photography, the CYGM filter is an alternative colour filter array to the Bayer filter (GRGB). It similarly uses a mosaic of pixel filters, of cyan, yellow, green and magenta, and so also requires demosaicing to produce a full-colour image.
CYGM gives more accurate luminance information than the Bayer filter, hence a wider dynamic range, but at the expense of colour accuracy.
The CYGM filter is far less common than the Bayer filter. CCDs that use it include the 3 megapixel Sony ICX252AK and ICS252AKF (which sampled in October 1999[1]).
Cameras that use it include several Canon models of the 1999-2000 period, such as the Canon PowerShot S10[2], the original Canon Digital IXUS (June 2000)[3], though subsequent IXUS models used the Bayer filter, and the Canon G1; the Kodak DCS 620x and DCS 720x DSLRs, and several Nikon Coolpix models[4].