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/neveropen.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
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