rg chromaticity
Color space / From Wikipedia, the free encyclopedia
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The RGB chromaticity space, two dimensions of the normalized RGB space,[1] is a chromaticity space, a two-dimensional color space in which there is no intensity information.
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In the RGB color space a pixel is identified by the intensity of red, green, and blue primary colors. Therefore, a bright red can be represented as (R,G,B) (255,0,0), while a dark red may be (40,0,0). In the normalized RGB space or RG space, a color is represented by the proportion of red, green, and blue in the color, rather than by the intensity of each. Since these proportions must always add up to a total of 1, we are able to quote just the red and green proportions of the color, and can calculate the blue value if necessary.