   #PHP Manual Image functions imagecolorstotal imagecopy

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                             imagecolortransparent

   (PHP 3, PHP 4 )
   imagecolortransparent -- Define a color as transparent

Description

   int imagecolortransparent ( resource image [, int color])

   imagecolortransparent() sets the transparent color in the image image
   to color. image is the image identifier returned by imagecreate() and
   color is a color identifier returned by imagecolorallocate().

     Note: The transparent color is a property of the image,
     transparency is not a property of the color. Once you have a set a
     color to be the transparent color, any regions of the image in that
     color that were drawn previously will be transparent.

   The identifier of the new (or current, if none is specified)
   transparent color is returned.
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