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SDL_Surface hue changes

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Ok I want a lot of diffrent colors of a picture but instead of going through the tedious work of converting all the colors exactly to a diffrent shade I figured out that if you take a color and change only the hue you get a diffrent color of the same shade, Im sure its quite complicated exactly how hue works but is there a way to find this value in a surface, or do you just have to modify the pixle color values? Is there actually a formula for hue conversion from one color to another? i.e RGB(240, 100, 50) Hue = 11; now lets say that I want to increase the hue, but didnt have a hue value, by what amounts do I increase the R,G,B respectavly? I worked at it for a while, its a VERY complicated formula that I never really figured out. Anyone know how this works? thanks =) looking back at my post its kind of confusing so ill try to clarify I want to ajust the Hue of a SDL_Surface. Problem is: there is not Hue value for SDL_Surface. Hue is just a number that you increase that has an effect on the RGB through a complicated formula. Anyone know what this formula is?

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