contrast.php

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<?php
/**
 * @package     Joomla.Platform
 * @subpackage  Image
 *
 * @copyright   Copyright (C) 2005 - 2013 Open Source Matters, Inc. All rights reserved.
 * @license     GNU General Public License version 2 or later; see LICENSE
 */

defined('JPATH_PLATFORM') or die;

/**
 * Image Filter class adjust the contrast of an image.
 *
 * @package     Joomla.Platform
 * @subpackage  Image
 * @since       11.3
 */
class JImageFilterContrast extends JImageFilter
{
        /**
         * Method to apply a filter to an image resource.
         *
         * @param   array  $options  An array of options for the filter.
         *
         * @return  void
         *
         * @since   11.3
         * @throws  InvalidArgumentException
         */
        public function execute(array $options = array())
        {
                // Validate that the contrast value exists and is an integer.
                if (!isset($options[IMG_FILTER_CONTRAST]) || !is_int($options[IMG_FILTER_CONTRAST]))
                {
                        throw new InvalidArgumentException('No valid contrast value was given.  Expected integer.');
                }

                // Perform the contrast filter.
                imagefilter($this->handle, IMG_FILTER_CONTRAST, $options[IMG_FILTER_CONTRAST]);
        }
}