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Gmagick::levelimage() is a method in the Gmagick library in PHP, which is used to adjust the levels of an image. The method takes in parameters for black point, gamma, and white point values, and modifies the image accordingly.

Here is an example of how you can use Gmagick::levelimage() in PHP:

php
// Create a new Gmagick object
$image = new Gmagick('path/to/image.jpg');

// Adjust the levels of the image
$image->levelimage($blackPoint, $gamma, $whitePoint);

// Save the modified image
$image->writeImage('path/to/modified_image.jpg');


In the above example, you will need to replace $blackPoint, $gamma, $whitePoint with the desired values for the level adjustment. These values determine the intensity of the black, mid-tone, and white levels in the image.

Make sure you have the Gmagick extension installed and enabled in your PHP configuration for this to work.