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In c#, you can get the HSL brightness of a color by doing Color.GetBrightness(). If I want to increase the brightness of a color by a certain percentage, I cannot simply multiply the individual RGB values by that amount. It seems HSL doesn't work like that. How would I do it?
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I think this article can help you with this and all other color related questions. It has C# source for all conversions and modifications.
RGB and HSL Colour Space Conversions