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



imagecolorsforindex — Determines the RGB components of a color.


array imagecolorsforindex(image, color);
int image: Image identifier
int color: Specified color


Associative array of color components


This function returns the same information as imagecolorat() , imagecolorexact() , and imagecolorclosest() , except that the color information is stored in an array containing three elements. The elements contain the red, green, and blue portions of the image, which can be used in other places. For example, each color value can be converted to a hex value and created as an HTML font color.


Example 401. Display some text in the same color as the image

$im = imagecreatefrompng($uploaded_file);
// get the nearest blue
$blue = imagecolorclosest($im, 0, 0, 255);
$blue_array = imagecolorsforindex($im, $blue);

while (list($key, $val) = each($blue_array)) {
    $color = dechex($val);
    if ($color == "00") {
        $color = "00";
    $font_color = $font_color . $color;
echo "<font color=\"#$font_color\">Image color</font>\n";

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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