How to Adjust Image Saturation in PHP with Imagick – A Step‑by‑Step Guide

In this article, we introduce image saturation—the purity and vividness of colors—and demonstrate how to adjust it in PHP using the Imagick library.

1. Install Imagick Library

Before starting, ensure the Imagick extension is installed on the server. You can verify the installation with the following command: php -m | grep imagick If the output contains "imagick", the extension is installed; otherwise, install it according to your environment.

2. Change Image Saturation

2.1 setImageAttribute()

The setImageAttribute() method accepts a saturation value ranging from -100 (no saturation) to +100 (maximum saturation). Below is a sample code that sets the saturation to 50.

$imagick = new Imagick('input.png');
$imagick->setImageAttribute('saturation', 50);
$imagick->writeImage('output.png');
$imagick->destroy();

2.2 setImageProperty()

Alternatively, you can use setImageProperty(), which works similarly to setImageAttribute(). The property name for saturation is "Saturation". The following example also sets saturation to 50.

$imagick = new Imagick('input.png');
$imagick->setImageProperty('Saturation', 50);
$imagick->writeImage('output.png');
$imagick->destroy();

3. Summary

By using the Imagick extension in PHP, you can easily adjust an image's saturation, enhancing its color vibrancy. Beyond saturation, Imagick also supports many other image processing functions such as cropping and scaling.