PHP | Imagick gammaImage() Function

The Imagick::gammaImage() function is an inbuilt function in PHP which is used to corrects the image by providing the Gamma-correction. The view of the same images on different devices will have perceptual differences in the way the image’s intensities are represented on the screen.

Syntax:

bool Imagick::gammaImage( $gamma, $channel )

Parameters: This function accepts two parameters as mentioned above and described below:

• $gamma: This parameter takes the amount of gamma-correction.
• $channel: This parameter takes the value of the channel. The value of default channel is Imagick::CHANNEL_DEFAULT.

Return Value: This function returns True on success.

Original Image:

Below program illustrates the Imagick::gammaImage() function in PHP:

Program:

<?php

// require_once('path/vendor/autoload.php');

// Image Header
header('Content-type: image/png');

// Create Imagick Object
$image = new Imagick('img/geeksforgeeks.png');

// Use gammaimage function
$image->gammaImage(2.2, Imagick::CHANNEL_DEFAULT);

// Display output image
echo $image;
?>

Output:

Reference: http://php.net/manual/en/imagick.gammaimage.php