HSBtoRGB ( hueDegrees ; satPercentage ; briPercentage )
Converts color from HSB/HSV values to RGB percentages.
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Function definition: (Copy & paste into FileMaker's Edit Custom Function window)
This function converts the specified color from hue, saturation, and brightness/value (HSB/HSV) to RGB percentages. (Note that HSB/HSV is not the same as HSL!)
Note that while hue is expressed in degrees, all other values are expressed in decimals between 0 and 1, inclusively. To use the output RGB values in a TextColor function, you'd first need to multiply them by 255 and round to whole numbers.
I'm sorry to say that I don't actually understand the math behind the function - I translated it from formulas listed on Wikipedia.
Note: these functions are not guaranteed or supported by BrianDunning.com. Please contact the individual developer with any questions or problems.