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



imagecolorexact — Determines whether a color is present in an image.


int imagecolorexact(image, red, green, blue);
int image: Image identifier
int red: Red component
int green: Gren component
int blue: Blue component


Color index or -1 on error


Returns the exact color in the image specified from the red, green, and blue components. If the color is not found, returns -1 to indicate an error. Useful for determining that an image fits a certain requirement. This is also a good example of how you can perform operations on an image without needing to output it at all.


Example 398. Search for an exact color

// search only for green
$uploaded_file = "test_image.png";
$im = imagecreatefrompng($uploaded_file);
if (imagecolorexact($im, 0, 255, 0) == -1) {
    echo "This image does not contain the correct green.\n";
} else {
    echo "This image contains the correct green.\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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