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imagecolorresolve — Determines the closest color match.


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


Color index


Returns a color the same as - or as close as possible to - the specified color. Unlike imagecolorexact() , but similar to imagecolorclosest() , this function always returns a color, even if the color returned is not at all similar to the RGB values specified. The function will move through the color palette of the image until it finds a close match, which may not be close at all.


Existing since version 3.0.2


Example 399. Determine the closest color

header("Content-type: image/png");
$im = imagecreate(200, 200);
$red = imagecolorallocate($im, 255, 0, 0);
$offblue = imagecolorallocate($im, 90, 90, 200);
imagefill($im, 0, 0, $red);
imagefilledrectangle($im, 10, 10, 40, 40, $offblue);
// get a close color and new box
$newblue = imagecolorresolve($im, 0, 0, 255);
imagefilledrectangle($im, 100, 100, 140, 140, $newblue);

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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