PHP | Gmagick getimagegamma() Function

PHP | Gmagick getimagegamma() Function

Last Updated : 21 Jan, 2020

The Gmagick::getimagegamma() function is an inbuilt function in PHP which is used to get the image gamma. The Gamma is a nonlinear operation used to encode and decode luminance or tristimulus values in images. Syntax:

float Gmagick::getimagegamma( void )

Parameters: This function doesn’t accept any parameter. Return Value: This function returns an float value containing the gamma. Exceptions: This function throws GmagickException on error. Below given programs illustrate the Gmagick::getimagegamma() function in PHP: Program 1 (For image with multiple colors):

php

<?php

// Create a new Gmagick object
// https://media.geeksforgeeks.org/wp-content/uploads/geeksforgeeks-13.png
$gmagick = new Gmagick('geeksforgeeks.png');

// Get the gamma
$gamma = $gmagick->getimagegamma();
echo $gamma;
?>

Output:

0.45454999804497

Program 2 (For image with single color):

php

<?php

// Create a new Gmagick object
// https://media.geeksforgeeks.org/wp-content/uploads/20200106200505/singlecolor.png
$gmagick = new Gmagick('singlecolor.png');

// Get the gamma
$gamma = $gmagick->getimagegamma();
echo $gamma;
?>

Output:

Reference: https://www.php.net/manual/en/gmagick.getimagegamma.php

PHP | Gmagick getimagegamma() Function

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