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

When developing web applications, adjusting an image's hue is a common requirement; the PHP Imagick extension offers powerful image‑processing capabilities such as scaling, cropping, rotating, and filtering.

Installation sudo apt-get install php-imagick After installing the extension, you can start using Imagick to modify image tones.

Loading an image

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

Adjusting hue, saturation, and brightness

The modulateImage method accepts three parameters: brightness , saturation , and hue . Each value ranges from –100% to +100%, where 0% leaves the original unchanged.

Example: set brightness to 50% of the original. $image->modulateImage(100, 50, 100); Saving or outputting the result

To write the modified image to a file: $image->writeImage('path/to/new_image.jpg'); Or send it directly to the browser:

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

Complete example

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

This script loads an image, reduces its saturation to 50%, and saves the adjusted image. Using Imagick for hue adjustments requires only a few lines of code, making it a flexible tool for various image‑processing needs.