   #PHP Manual Image functions imagecolorclosest imagecolorclosesthwb

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                            imagecolorclosestalpha

   (PHP 4 >= 4.0.6)
   imagecolorclosestalpha -- Get the index of the closest color to the
   specified color + alpha

Description

   int imagecolorclosestalpha ( resource image, int red, int green, int
   blue, int alpha)

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

     Note: This function was added in PHP 4.0.6 and requires GD 2.0.1

   See also imagecolorexactalpha().
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