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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

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