Adjust Image Hue Using PHP Imagick

When developing web applications, you often need to process and adjust images, such as changing their hue. In PHP, the Imagick extension provides powerful image‑manipulation capabilities, including scaling, cropping, rotating, and applying filters.

First, install the Imagick extension:

sudo apt-get install php-imagick

After installation, you can create an Imagick object and load an image:

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

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

For example, to set the image brightness to 50% of the original:

$image->modulateImage(100, 50, 100);

Save the modified image with writeImage or output it directly to the browser.

$image->writeImage('path/to/new_image.jpg');

Or send it 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 code loads an image, adjusts its hue, and saves the result. Using Imagick, you can quickly modify brightness, saturation, and hue with just a few lines of PHP.