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George Hotelling http://george.hotelling.net/

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Get the inverse of a hex color in Ruby

This method will return the inverse of a hex color, which is useful if you want to make sure that your text will show up on a colored background.

   1  def invert_color(color)
   2    color.gsub!(/^#/, '')
   3    sprintf("%X", color.hex ^ 0xFFFFFF)
   4  end


Example:

   1  invert_color('#c0c0c0') #=> "3F3F3F"


Limitations:

Doesn't handle named colors or 3 digit colors (i.e. #FFF == #FFFFFF)

to ruby color colormath hexidecimal by georgehotelling on Aug 17, 2005 1 Comments
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