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

When building web applications you often need to modify image tones. PHP's Imagick extension offers powerful image manipulation capabilities, including adjustments to hue, brightness, and saturation.

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

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

Adjust the tone using modulateImage. The method accepts three parameters—brightness, saturation, and hue—each ranging from -100% to +100% (0% leaves the value unchanged). For example, to reduce saturation to 50% while keeping brightness and hue unchanged: $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 combining all steps:

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

This short script demonstrates loading an image, adjusting its tone, and persisting the result, showing how Imagick makes image processing in PHP straightforward.