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 FileMaker Pro Custom Functions

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RGBtoHSL ( redPercentage; greenPercentage; bluePercentage )

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  Average rating: 4.4  (25 votes)
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Joe Rovang, /

Converts color from RGB percentages to HSL values.

Sample Input:
RGBtoHSL ( 1; 0; 0 ) // red
Sample Output:


 Then copy & paste into FileMaker Advanced's Edit Custom Function window.

Click here to copy To Clip Manager if you have myFMbutler's Clip Manager installed


This function converts the specified color RGB percentages to hue, saturation, and lightness (HSL) values. (Note that HSL is not the same as HSB/HSV!)

All values except hue are in decimals between 0 and 1, inclusively. RGB values on the 0-255 scale must be divided by 255 before using them in this function.

Note: these functions are not guaranteed or supported by Please contact the individual developer with any questions or problems.

This is my Custom Function and I want to edit it


The example RGBtoHSL ( 1; 0; 0 ) returns "0¶?¶1".

The mistake is probably in the line 14:

sumC = maxC + maxC;

It should probably be:

sumC = maxC + minC;

Is that correct?

Alexander Zueiv, Tashkent
October 20, 2012 12:04am

Yes, thanks, careless translation from Java. Edited.

Joe Rovang, /
October 20, 2012 4:46am

Make a comment about this Custom Function (please try to keep it brief & to the point). Anyone can post:

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Answer 7 + 3 =
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