LRGB, short for Luminance, Red, Green and Blue, is a photographic technique used in amateur astronomy for producing good quality colour photographs by combining a high-quality black-and-white image with a lower-quality colour image. In amateur astronomy, it is easier and cheaper to obtain good quality, high signal-to-noise ratio, images in black a...
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http://en.wikipedia.org/wiki/LRGB
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http://www.encyclo.co.uk/local/20895
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