HSLtoRGB ( hueDegrees ; satPercentage ; liPercentage )

Converts color from HSL values to RGB percentages.

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Sample input:

HSLtoRGB ( 0; 1; .5 ) // red

Sample output:

1¶
0¶
0

Function definition: (Copy & paste into FileMaker's Edit Custom Function window)

If ( satPercentage = 0; List ( liPercentage; liPercentage; liPercentage );

Let (

[

h = Mod ( hueDegrees; 360 ) / 360;
s = satPercentage;
li = liPercentage;

oneThird = 1/3;
oneSixth = 1/6;
twoThirds = 2/3;

q = If ( li < .5;
	li * ( 1 + s );
	( li + s ) - ( li * s )
);

p = ( 2 * li ) - q;
qpDiff = q - p;

tempRRaw = h + oneThird;
tempR = tempRRaw - ( tempRRaw > 1 );
tempG = h;
tempBRaw = h - oneThird;
tempB = tempBRaw + ( tempBRaw < 0 );

r = Case (
	( tempR < oneSixth ); p + ( qpDiff * 6 * tempR );
	( tempR < .5 ); q;
	( tempR < twoThirds ); p + ( qpDiff * ( twoThirds - tempR ) * 6 );
	p
);

g = Case (
	( tempG < oneSixth ); p + ( qpDiff * 6 * tempG );
	( tempG < .5 ); q;
	( tempG < twoThirds ); p + ( qpDiff * ( twoThirds - tempG ) * 6 );
	p
);

b = Case (
	( tempB < oneSixth ); p + ( qpDiff * 6 * tempB );
	( tempB < .5 ); q;
	( tempB < twoThirds ); p + ( qpDiff * ( twoThirds - tempB ) * 6 );
	p
)

];

List ( r; g; b )

) // end Let
) // end If

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

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.

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

HSLtoRGB ( hueDegrees ; satPercentage ; liPercentage )

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