How to Adjust Image Saturation in PHP Using Imagick

1. Install Imagick Library

Before starting, ensure the Imagick extension is installed on the server. You can check it 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

We will use two methods provided by Imagick to adjust saturation:

1) setImageAttribute()

2) setImageProperty()

The following sections describe each method.

2.1 setImageAttribute()

The setImageAttribute() method accepts a saturation value ranging from -100 (no saturation) to +100 (maximum saturation).

Example code:

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

This code creates an Imagick object, loads "input.png", sets saturation to 50, writes the result to "output.png", and destroys the object.

2.2 setImageProperty()

The setImageProperty() method works similarly to setImageAttribute() . The property name is "Saturation".

Example code:

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

The only difference is the use of setImageProperty() with the property name "Saturation".

3. Summary

By using the Imagick extension in PHP, you can easily adjust an image's saturation with either setImageAttribute() or setImageProperty() , and also perform other image manipulations such as cropping and scaling.