| Gamma | Performs a gamma correction on an image. |
<?php
namespace Grafika\Gd\Filter;
use Grafika\FilterInterface;
use Grafika\Gd\Image;
/**
* Performs a gamma correction on an image.
*/
class Gamma implements FilterInterface{
/**
* @var float
*/
protected $amount; // >= 1.0
/**
* Gamma constructor.
* @param float $amount The amount of gamma correction to apply. >= 1.0
*/
public function __construct($amount)
{
$this->amount = (float) $amount;
}
/**
* @param Image $image
*
* @return Image
*/
public function apply( $image ) {
imagegammacorrect($image->getCore(), 1, $this->amount);
return $image;
}
}