   #PHP Manual Image functions imagerotate imagesetbrush

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                                imagesavealpha

   (PHP 4 >= 4.3.2)
   imagesavealpha --  Set the flag to save full alpha channel information
   (as opposed to single-color transparency) when saving PNG images.

Description

   bool imagesavealpha ( resource image, bool saveflag)

   imagesavealpha() sets the flag to attempt to save full alpha channel
   information (as opposed to single-color transparency) when saving PNG
   images.

   You have to unset alphablending (imagealphablending($im, FALSE)), to
   use it.

   Alpha channel is not supported by all browsers, if you have problem
   with your browser, try to load your script with an alpha channel
   compliant browser, e.g. latest Mozilla.

   See also imagealphablending().
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