int imagecolorallocate (int im, int red, int green, int blue)
ImageColorAllocate() returns a color identifier representing the color composed of the given RGB components. The im argument is the return from the imagecreate() function. ImageColorAllocate() must be called to create each color that is to be used in the image represented by im.
$white = ImageColorAllocate ($im, 255, 255, 255);
$black = ImageColorAllocate ($im, 0, 0, 0);
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