EvaluationContext.Colour.Hex.Luminance

Extracts the luminance component from a hex color

Syntax

EvaluationContext.Colour.Hex.Luminance(hexColor)

Parameters

Parameter	Type	Required	Description
hexColor	STRING	Yes	The hex color to evaluate (e.g., “■ #01B8AA”)

Returns

(DOUBLE) Luminance value (0-1)

Example

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

Definition

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