How to Adjust Image Hue in PHP with Imagick: Step‑by‑Step Guide

When building web applications, adjusting an image's hue is a common requirement. The PHP Imagick extension provides powerful image manipulation capabilities, including hue, brightness, and saturation adjustments.

First install the extension: sudo apt-get install php-imagick Create an Imagick instance and load the image:

$image = new Imagick();
$image->readImage('path/to/image.jpg');

Use modulateImage to change brightness, saturation, and hue. The method accepts three parameters (brightness, saturation, hue) ranging from -100% to +100%, where 0% leaves the value unchanged.

Example: set brightness to 100%, saturation to 50%, hue to 100% (reducing saturation by half): $image->modulateImage(100, 50, 100); Save the modified image to a file: $image->writeImage('path/to/new_image.jpg'); Or output directly to the browser:

header('Content-type: image/jpeg');
$image->setImageFormat('jpeg');
echo $image;

Full example combines all steps:

$image = new Imagick();
$image->readImage('path/to/image.jpg');
$image->modulateImage(100, 50, 100);
$image->writeImage('path/to/new_image.jpg');

Imagick makes hue adjustment straightforward with just a few lines of code, allowing developers to fine‑tune brightness, saturation, and hue for various visual effects.