"On-chip" color filters have become an attractive method of converting monochromatic, solid-state image sensors into color because they represent a good compromise between cost and resolution for digital cameras. The color filters are applied directly to the surface of the image sensor in a pattern of pixel size mosaics or pixel wide stripes. Photoresis is commonly used to produce these filters by successively depositing and patterning layers of each clor. The choice of colors can vary from additive (R, G, B) to subtractive (C, M, Y) or combinations of both.
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