Many other types of color filter arrays exist, such as CYGM using CYAN, YELLOW, GREEN, and MAGENTA filters in equal numbers, the RGBE found in Sony's DSC-F828, etc.
Color Filter Array - Or CFA are filters placed over areas in a photo on an image sensor. Image sensor only read grayscale, thus color filter array is needed to capture color info.
Color filter array. A colored panel placed over the sensor, which keeps the sensors photosites (which are sensitive to all colors) from responding to light other than the color assigned to that pixel/photosite.
Color Filter Array (CFA)
A mosaic array of color filters placed over the pixel elements of an image sensor to record color information. The Bayer pattern is most commonly used and is comprised of 50% green, 25% red, and 25% blue filters.
The Bayer Pattern color filter array (CFA) invented by Eastman Kodak researcher Bryce Bayer. The order in which dyes are placed on an image sensor photosite, is still in use today.
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Because digital cameras rely on a separate color filter array (CFA) placed in front of the CCD to create their notion of scene color, they are subject to a unique form of distortion.
A more economical and practical way to record the primary colors is to permanently place a filter called a color filter array over each individual photosite.
The photons then pass through a color filter array (also known as a Bayer filter). Finally, the photons enter the pixel.
 See also: Color, Image, Filter, Sensor, Pixel
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