Sensors
The New Foveon Sensors The cone-shaped cells inside our eyes are sensitive to red, green, and blue—the "primary colors". We perceive all other colors as combinations of these primary colors. In conventional photography, the red, green, and blue components of light expose the corresponding chemical layers of color film. The new Foveon sensors are based on the same principle, and have three sensor layers that measure the primary colors, as shown in this diagram. Combining these color layers results in a digital image, basically a mosaic of square tiles or " pixels " of uniform color which are so tiny that it appears uniform and smooth. As a relatively new technology, Foveon sensors are currently only available in the Sigma SD9 and SD10 digital SLRs and have drawbacks such as relatively low-light sensitivity. The Current Color Filter Array Sensors All other digital camera sensors only measure thebrightness of each pixel. As shown in this diagram, a "color filt...