What is PhpDig?
PhpDig is a PHP MySQL based
Web Spider & Search Engine.
imagecolorclosest — Finds the closest color in the
image to the color required.
int imagecolorclosest(image, red,
int image: Image
int red: Red component
int green: Green
int blue: Blue
This function, along with other functions, is good for
color manipulation inside a dynamic image.
imagecolorclosest() lets you specify a custom
color, and the function searches for and returns the
closest match it can find in the color palette. It's not
useful in a function such as imagecolortransparent() , but
can be used for other purposes such as determining
whether the base image contains a required range of color
without actually needing the exact color.
Example 395. 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
$newblue = imagecolorclosest($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
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