   #PHP Manual Image functions imagecolorat imagecolorclosestalpha

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                               imagecolorclosest

   (PHP 3, PHP 4 )
   imagecolorclosest -- Get the index of the closest color to the
   specified color

Description

   int imagecolorclosest ( resource image, int red, int green, int blue)

   Returns the index of the color in the palette of the image which is
   "closest" to the specified RGB value.

   The "distance" between the desired color and each color in the palette
   is calculated as if the RGB values represented points in
   three-dimensional space.

   See also imagecolorexact().
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