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Psychological formula for converting RGB to gray value
2022-04-23 20:34:00 【One Mr rabbit one】
stay sRGB Color space is ：
luminance=0.299∗color.r+0.587∗color.g+0.114∗color.b
In the linear color space is ：
luminance=0.2125∗color.r+0.7154∗color.g+0.0721∗color.b
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