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PhpDig is a PHP MySQL based
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imagecolortransparent — Sets a color as transparent.


int imagecolortransparent(image, color);
int image: Image identifier
int color: Specified color


Index of transparent color


Sets the portions of an image containing the specified color to be transparent. Using a combination of imagecolorexact() , imagecolorclosest() , and/or imagecolorat() , transparent images can be built on the fly without knowing the exact background color. This depends on the layout of the original image, of course.


Example 403. Create a transparent image

header("Content-type: image/png");
$im = imagecreatefrompng("test_image.png");
$bg_color = imagecolorat($im,1,1);
imagecolortransparent($im, $bg_color);

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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