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imagecolorallocate — Allocates a color in an image.


string imagecolorallocate(image, red, green, blue);
int image: Image identifier
int red: Red component
int green: Green component
int blue: Blue component


Color identifier


imagecolorallocate() creates a color that can be used in other image functions. The red, green, and blue components are the standard 0-255 values, and combinations of each allow for 16,777,216 (256 ^ 3) possible colors. This function must be called for each color that's used in the image. It's normally a good idea to give each assigned color a meaningful variable name for easy reference.


Example 393. Create a turquoise square

header("Content-type: image/png");
$im = imagecreate(200, 200);
$turq = imagecolorallocate($im, 75, 200, 150);
imagefill($im, 0, 0, $turq);

PHP Functions Essential Reference. Copyright © 2002 by New Riders Publishing (Authors: Zak Greant, Graeme Merrall, Torben Wilson, Brett Michlitsch). This material may be distributed only subject to the terms and conditions set forth in the Open Publication License, v1.0 or later (the latest version is presently available at The authors of this book have elected not to choose any options under the OPL. This online book was obtained from and is designed to provide information about the PHP programming language, focusing on PHP version 4.0.4 for the most part. The information is provided on an as-is basis, and no warranty or fitness is implied. All persons and entities shall have neither liability nor responsibility to any person or entity with respect to any loss or damage arising from the information contained in this book.

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