PHP | Gmagick getimageextrema() Function

The Gmagick::getimageextrema() function is an inbuilt function in PHP which is used to get the extrema for an image. Extrema are the points at which a maximum or minimum value of a function is observed.

Syntax:

array Gmagick::getimageextrema( void )

Parameters:This function doesn’t accept any parameters.

Return Value: This function returns an associative array containing the keys as “min” and “max”.

Exceptions: This function throws GmagickException on error.

Below given programs illustrate the Gmagick::getimageextrema() function in PHP:

Program 1 (For multiple colored image):

<?php

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

// Get the extrema
$extrema = $gmagick->getimageextrema();
print("<pre>".print_r($extrema, true)."</pre>");
?>

Output:

Array
(
    [min] => 0
    [max] => 65535
)

Program 2 (For single colored image):

<?php

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

// Get the extrema
$extrema = $gmagick->getimageextrema();
print("<pre>".print_r($extrema, true)."</pre>");
?>

Output:

Array
(
    [min] => 7710
    [max] => 7710
)

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