<?php
/*
    +--------------------------------------------------------------------------------------------+
    |   DISCLAIMER - LEGAL NOTICE -                                                              |
    +--------------------------------------------------------------------------------------------+
    |                                                                                            |
    |  This program is free for non comercial use, see the license terms available at            |
    |  http://www.francodacosta.com/licencing/ for more information                              |
    |                                                                                            |    
    |  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; |
    |  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
    |                                                                                            |
    |  USE IT AT YOUR OWN RISK                                                                   |
    |                                                                                            |
    |                                                                                            |
    +--------------------------------------------------------------------------------------------+

*/
/**
 * phMagick - Color manipulation function
 *
 * @package    phMagick
 * @version    0.1.0
 * @author     Nuno Costa - hide@address.com
 * @copyright  Copyright (c) 2007
 * @license    http://www.francodacosta.com/phmagick/license/
 * @link       http://www.francodacosta.com/phmagick
 * @since      2008-03-13
 */
class phMagick_color {
	   function darken(phmagick $p ,$alphaValue = 50){
        $percent = 100 - (int) $alphaValue;

        //get original file dimentions

        list ($width, $height) = $p->getInfo();

        $cmd = $p->getBinary('composite');
        $cmd .=  ' -blend  ' . $percent . ' ';
        $cmd .= '"'.$p->getSource().'"';
        $cmd .= ' -size '. $width .'x'. $height.' xc:black ';
        $cmd .= '-matte "' . $p->getDestination().'"' ;

        $p->execute($cmd);
        $p->setSource($p->getDestination());
        $p->setHistory($p->getDestination());
        return  $p ;
    }

    /**
     *
     *  Brightens an image, defualt: 50%
     *
     * @param $imageFile String - Physical path of the umage file
     * @param $newFile String - Physical path of the generated image
     * @param $alphaValue Integer - 100: white , 0: original color (no change)
     * @return boolean - True: success
     */
    function brighten(phmagick $p, $alphaValue = 50){

        $percent = 100 - (int) $alphaValue;

        //get original file dimentions

        list ($width, $height) = $p->getInfo();

        $cmd = $p->getBinary('composite');
        $cmd .=  ' -blend  ' . $percent . ' ';
        $cmd .= '"'.$p->getSource().'"';
        $cmd .= ' -size '. $width .'x'. $height.' xc:white ';
        $cmd .= '-matte "' . $p->getDestination().'"' ;

        $p->execute($cmd);
        $p->setSource($p->getDestination());
        $p->setHistory($p->getDestination());
        return  $p ;
    }
    
    /**
     * Convert's the image to grayscale
     */
//    function toGrayScale(phmagick $p){
//        $cmd  = $p->getBinary('convert');
//        $cmd .= ' "' . $p->getSource() .'"';
//        $cmd .= ' -colorspace Gray  ';
//        $cmd .= ' "' . $p->getDestination().'"' ;
//
//        $p->execute($cmd);
//        $p->setSource($p->getDestination());
//        $p->setHistory($p->getDestination());
//        return  $p ;
//    }

	function toGreyScale(phmagick $p, $enhance=2){
		$cmd   = $p->getBinary('convert');
		$cmd .= ' -modulate 100,0 ' ;
		$cmd .= ' -sigmoidal-contrast '.$enhance.'x50%' ;
		$cmd .= ' -background "none" "' . $p->getSource().'"' ;
		$cmd .= ' "' . $p->getDestination() .'"';
		
		$p->execute($cmd);
		$p->setSource($p->getDestination());
		$p->setHistory($p->getDestination());
		return  $p ;
	}

    /**
     * Inverts the image colors
     */
    function invertColors(phmagick $p){
        $cmd  = $p->getBinary('convert');
        $cmd .= ' "' . $p->getSource() .'"';
        $cmd .= ' -negate ';
        $cmd .= ' "' . $p->getDestination() .'"';

        $p->execute($cmd);
        $p->setSource($p->getDestination());
        $p->setHistory($p->getDestination());
        return  $p ;
    }
    
    function sepia(phmagick $p, $tone = 90){
		$cmd   = $p->getBinary('convert');
		$cmd .= ' -sepia-tone '. $tone .'% ' ;
		$cmd .= ' -modulate 100,50 ' ;
		$cmd .= ' -normalize ' ;
		$cmd .= ' -background "none" "' . $p->getSource() .'"' ;
		$cmd .= ' "' . $p->getDestination().'"' ;
	     $p->execute($cmd);
	     $p->setSource($p->getDestination());
	     $p->setHistory($p->getDestination());
	    return  $p ;
    }
    
	function autoLevels(phmagick $p){
		$cmd  = $p->getBinary('convert');
		$cmd .= ' -normalize ' ;
		$cmd .= ' -background "none" "' . $p->getSource().'"'  ;
		$cmd .= ' "' . $p->getDestination() .'"' ;
		
		$p->execute($cmd);
		$p->setSource($p->getDestination());
		$p->setHistory($p->getDestination());
		return  $p ;
	}
	
}
?>