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LightenColor ( coloreHex ; lightenDec )

Lighten a hexadecimal colour by a decimal value.

  Average rating: 5.0 (1 vote) Log in to vote

Martin Pineault - Show more from this author f.i.SCIENCES Développement inc. http://www.fisciences.com

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

Let ( [ // colorHex = "FF00FF" ; lightenDec = 20 ; // Debug code colorHex = Right ( colorHex ; 6 ) ; // Make sure no # at beginning r = HexToDec ( Left ( colorHex ; 2 ) ) + lightenDec ; g = HexToDec ( Middle ( colorHex ; 3 ; 2 ) ) + lightenDec ; b = HexToDec ( Right ( colorHex ; 2 ) ) + lightenDec ; threshold = 255.999 ; m = Max ( r ; g ; b ) ; total = r + g + b ; x = (3 * threshold - total) / (3 * m - total) ; gray = threshold - x * m ] ; Case ( m < threshold ; NumToHex ( r ) & NumToHex ( g ) & NumToHex ( b ) ; total ≥ 3 * threshold ; NumToHex ( Int ( threshold ) ) & NumToHex ( Int ( threshold ) ) & NumToHex ( Int ( threshold ) ) ; NumToHex ( Int ( gray+x*r ) ) & NumToHex ( Int ( gray+x*g ) ) & NumToHex ( Int ( gray+x*b ) ) ) ) Click to copy

Does take care of overflow.
Miss the possibility to decrease/darken (-20).

 

Comments

		Hans Nagelgast, None May 26, 2020
I would like to use this function, but the used commands are in French. The English version will not accept this code. Could you provide an English version too?

		Martin Pineault, f.i.SCIENCES Développement inc. May 26, 2020
Oups, there you go!

		Martin Pineault, f.i.SCIENCES Développement inc. May 26, 2020
Oups, there you go!

		Lazarus Sismanis, Decision Group May 27, 2020
Seem to be a very useful custom function. However, it references custom functions 'DecToHex' and 'HexToDec'. While the second is available on this site, there is no matching custom function for 'DecToHex'. Can you please provide? Thank you sir.

		Martin Pineault, f.i.SCIENCES Développement inc. May 27, 2020
I renamed 'DecToHex' to 'NumToHex' should be fine now. Thank you for pointing that out!

		Lazarus Sismanis, Decision Group May 27, 2020
Excellent stuff! Thanks Martin.

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