CYGM filter

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In digital photography, the CYGM filter is an alternative color 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].

References

1. ^ http://www.dpreview.com/news/9909/99090702sony3megapixel.asp
2. ^ http://www.dpreview.com/reviews/canons10/page2.asp
3. ^ http://www.dpreview.com/reviews/canondigitalixus300/
4. ^ (Russian) http://www.fcenter.ru/online.shtml?articles/hardware/digitalphoto/4197