colorContrast ( color )

Returns a 0 for dark and 1 for bright

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Sample input:

colorContrast ( "#7962a8" )

Sample output:

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

// COLOR CONTRAST

// Returns a 0 for dark and 1 for bright
// Input HEX format colour


Let ( [
	
	// Input variables
	~color = Substitute ( Filter ( Upper ( color ) ; "0123456789ABCDEF" ) ; [ "A" ; ":" ] ; [ "B" ; ";" ] ; [ "C" ; "<" ] ; [ "D" ; "=" ] ; [ "E" ; ">" ] ; [ "F" ; "?" ] ) ; // Hex color input (e.g., "#7962a8")

	// Extract RGB components from hex color
	~r = ( Code ( Middle ( ~color ; 2 ; 1 ) ) - 48 ) + ( Code ( Middle ( ~color ; 1 ; 1 ) ) - 48 ) * 16 ;
	~g = ( Code ( Middle ( ~color ; 4 ; 1 ) ) - 48 ) + ( Code ( Middle ( ~color ; 3 ; 1 ) ) - 48 ) * 16 ;
	~b = ( Code ( Middle ( ~color ; 6 ; 1 ) ) - 48 ) + ( Code ( Middle ( ~color ; 5 ; 1 ) ) - 48 ) * 16 ;

	// Calculate colour luminance
	~luminance = ( .299 * ~r ) + ( .587 * ~g ) + ( .114 * ~b )

	] ;

	~luminance > 128 // Returns 1 if light, 0 if dark

)

// BD Link : https://www.briandunning.com/cf/2782
// Written by: jonni@me.com
// V 1.0

Returns a 0 for dark and 1 for bright
Input HEX format colour

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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.

colorContrast ( color )

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