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Hex.Luminance

Extracts the luminance component from a hex color

EvaluationContext.Colour.Hex.Luminance( hexColor )
Parameter Type Required Description
hexColor STRING The hex color to evaluate (e.g., "#01B8AA")

DOUBLE Luminance value (0-1)

EvaluationContext.Colour.Hex.Luminance("#5E81AC") // Returns 0.52

function 'EvaluationContext.Colour.Hex.Luminance' =
        (
            hexColor: STRING
        ) =>

            VAR CleanHex = IF( LEFT( hexColor, 1) = "#", MID( hexColor, 2, 6), MID( hexColor, 1, 6 ) )
            VAR R = EvaluationContext.Colour.Hex.ToInt( MID( CleanHex, 1, 2 ) )
            VAR G = EvaluationContext.Colour.Hex.ToInt( MID( CleanHex, 3, 2 ) )
            VAR B = EvaluationContext.Colour.Hex.ToInt( MID( CleanHex, 5, 2 ) )

            VAR Mx = MAX( MAX( R, G ), B)
            VAR Mn = MIN( MIN( R, G ), B)
            VAR Delta = Mx - Mn

            VAR L = ( Mx + Mn ) / 2
            VAR result = ROUND( L, 4 ) / 255

            RETURN result