(PHP 4 >= 4.0.6, PHP 5, PHP 7) Convert a true color image to a palette image
(PHP 4 >= 4.0.7, PHP 5, PHP 7) Output GD2 image to browser or file
(PHP 4, PHP 5, PHP 7) Create a new palette based image
(PHP 5 >= 5.2.2, PHP 7) Captures a window
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