'Algorithm to desaturate RGB color

I have a question. Is there some way or some algorithm that I can use to desaturate an RGB value without converting the color to HSV or HSL? My RGB input is going to be fully saturated, therefore I just need a way to desaturate my color.

I'm working on a color picker and I need a fast and efficient way of doing this. Any suggestions would be much appreciated:)

algorithmcolorsrgbhsv


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