   #PHP Manual Image functions imagecolorexact imagecolormatch

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                             imagecolorexactalpha

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

Description

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

   Returns the index of the specified color+alpha in the palette of the
   image.

   If the color does not exist in the image's palette, -1 is returned.

   See also imagecolorclosestalpha().

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