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,
int image: Image
int red: Red component
int green: Green
int blue: Blue
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
$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
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.