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imageblendedcolorallocate is a function that will allocate a new blended color based on two existing allocated colors for your PHP GD images.


With Composer

This project offers support for the Composer dependency manager. You can find the imageblendedcolorallocate package online on

Install using Composer

Either run this command:

composer require andrewgjohnson/imageblendedcolorallocate

or add this to the require section of your composer.json file:

"andrewgjohnson/imageblendedcolorallocate": "1.*"

Without Composer

To use without Composer add an include to the imageblendedcolorallocate.php source file.

include_once 'source/imageblendedcolorallocate.php';


// standard method to allocate a color for an image
$red = imagecolorallocate($im, 0xFF, 0x00, 0x00);
$yellow = imagecolorallocate($im, 0xFF, 0xFF, 0x00);

// this will allocate an average of our two previously allocated colors
$orange = imageblendedcolorallocate($im, $red, $yellow);

// yes, we do support alpha if you want to use transparent or translucent colors
$opaqueBlack = imagecolorallocatealpha($im, 0x00, 0x00, 0x00, 0);
$translucentBlack = imagecolorallocatealpha($im, 0x00, 0x00, 0x00, 63);
$blendedBlack = imageblendedcolorallocate($im, $opaqueBlack, $translucentBlack);

// by default we do a 50/50 blend where we average the red, blue, green & alpha values for each color
// we also support non-50/50 blends
$blue = imagecolorallocate($im, 0x00, 0x00, 0xFF);
$cyan = imagecolorallocate($im, 0x00, 0xFF, 0xFF);
$blendedMostlyCyan = imageblendedcolorallocate($im, $blue, $cyan, 0.25); // 25% blue, 75% cyan
$blendedEvenly = imageblendedcolorallocate($im, $blue, $cyan); // 50% blue, 50% cyan
$blendedMostlyBlue = imageblendedcolorallocate($im, $blue, $cyan, 0.75); // 75% blue, 25% cyan

There are other examples included in the GitHub repository and on

Help Requests

Please post any questions on if you need help.

If you discover a bug please enter an issue on GitHub. When submitting an issue please use our issue template.


Please read our contributing guidelines if you want to contribute.


This project was started by Andrew G. Johnson (@andrewgjohnson).

Full list of contributors:

Our issue template & pull request template come via the stevemao/github-issue-templates project. The mountains photo comes via Gabriel Garcia Marengo.


You can find all notable changes in the changelog.