What is PhpDig?
PhpDig is a PHP MySQL based
Web Spider & Search Engine.



imagecolorclosesthwb — Finds closest color in image to that required.


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


Color index


Returns the closest match in the image palette to that specified in the function parameters. Unlike imagecolorclosest() , this function bases a match on the hue (H), whiteness (W), and blackness (B) closest to the specified color. It's more effective at matching than imagecolorclosest() . Requires GD version 1.8 or better.


Existing since version 4.0.1


Example 396. Get the actual color closest to the desired color from an image

header("Content-type: image/png");
$im = imagecreate(200, 200);
$red = imagecolorallocate($im, 255, 0, 0);
// create a shade of blue
$offblue = imagecolorallocate($im, 90, 90, 200);
imagefill($im, 0, 0, $red);
imagefilledrectangle($im, 10, 10, 40, 40, $offblue);
// get closest color to actual blue from image
$newblue = imagecolorclosesthwb($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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