PHP | Imagick autoLevelImage() Function

The Imagick::autoLevelImage() function is an inbuilt function in PHP which is used to adjusts the levels of a particular image channel. The level of the image channel is set the minimum and maximum value of color in the full quantum range.

Syntax:

bool Imagick::autoLevelImage( $channel )

Parameters: This function accepts a single parameters $channel which is used to set the auto-levelling.

Return Value: This function returns True on success.

Below programs illustrate the Imagick::autoLevelImage() function in PHP:

Program 1:

<?php

// Create an image object
$imagick = new Imagick(
'https://media.geeksforgeeks.org/wp-content/uploads/geeksforgeeks-9.png');

// Set the autolevelling of image
$imagick->autoLevelImage();

// Display the image
header("Content-Type: image/jpg");
echo $imagick->getImageBlob();
?>

Output:

Program 2:

<?php

// Create an image object
$imagick = new Imagick(
'https://media.geeksforgeeks.org/wp-content/uploads/slider.gif');

// Set the autolevelling of image
$imagick->autoLevelImage();

// Display the image
header("Content-Type: image/gif");
echo $imagick->getImageBlob();
?>

Output:

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