PHP Image Class: Apply several types of image effects

Image class for basic image redesign.
Author: Daniel Kovacs
Email: kovacsdanielhun@gmail.com
Webiste: kovacsdaniel.blogspot.com
Version: 1.0 beta
Release date: 2012.01.18

Thanks to:
http://www.tuxradar.com/practicalphp/11/2/16 (special algorythms)
http://php.about.com/od/gdlibrary/ss/grayscale_gd.htm (black and white algorythm)

It's in beta version, so there can be bugs, if you find any, or you have some new ideas for functions I should implement, please write to
kovacsdanielhun@gmail.com.

Known Issues:
- This class can only work with gifs and jpegs, and pngs
- scatter bugs a little


Installation:
1. Copy file to your website's folder
2. Include it
3. Set up settings 

    $image = new Image;
    $settings   = array();
    $jobs       = array();
        
    /* Set up settings */
    $settings['original_name']  = 'anyfolder/source.jpeg';
    $settings['new_name']       = 'folder/dest.jpeg';
    
    /* */
    $settings['original_type']  = 'jpeg';
    $settings['new_type']       = 'jpeg';
    
4. Set up jobs 

    /* You need to fill the 'jobs' $jobs with jobs like: */
    $jobs[0]['job']     = "filter";
    $jobs[0]['filter']  = "contrast";
    $jobs[0]['contrast'] = 50;  
    
    $jobs[1]['job']     = "duotone";
    $jobs[1]['rplus']   = 10;
    $jobs[1]['gplus']   = 40;
    $jobs[1]['bplus']   = 80; 
    
    $jobs[2]['job']         = 'resize';
    $jobs[2]['width']       = 10;
    $jobs[2]['height']      = 0;
    $jobs[2]['percent']     = 0;
    $jobs[2]['scale']       = 0; 
    
    /* You can have plenty of jobs, just have to increase $jobs[$i] ($i) */
    /* You can see other usable filters and jobs under */
    
    /* To start processing type these: */
    $image->settings = $settings;
    $image->jobs     = $jobs;
    $image->run();
    
5. get image or render image ( when you render an image, after render it destroys the image in memory )

    /* To get image you can use this: */
    $image->image;
    /* or/and */
    $image->render_image();

6. get errors
    $image->errors(); /* array */

Available Jobs:
 
   $jobs[0]['job']          = 'crop'
   $jobs[0]['left']         = 120; (pixels from left)
   $jobs[0]['top']          = 120; (pixels from top)
   $jobs[0]['right']     = 120; (pixels from right)
   $jobs[0]['bottom']    = 120; (pixels from bottom)

 

   $jobs[0]['job']           = "rotate";
   $jobs[0]['angle']         =  0;
   $jobs[0]['background']    =  0;
   $jobs[0]['transparent']   =  0;


    $jobs[0]['job']   = "watermark";
    $jobs[0][0]       = 0;
    $jobs[0][1]       = 0;
    $jobs[0][2]       = "watermark.png";

    $jobs[0]['job']      = "resize";
    $jobs[0]['width']    = 0;
    $jobs[0]['height']   = 0;
    $jobs[0]['percent']  = 0;
    
Available Special Effects (Algorythms)

    $jobs[0]['job']      = "blackwhite";
    
    $jobs[0]['job']      = "interlace";
    
    $jobs[0]['job']      = "screen";
    
    $jobs[0]['job']      = "duotone";
    
    $jobs[0]['job']      = "noise";
    
    $jobs[0]['job']      = "scatter";
    
    $jobs[0]['job']      = "color_reduction";
    
Available Filters:

    $jobs[0]['job']     = "filter";
    $jobs[0]['filter']  = "colorize";
    $jobs[0]['r'] = 255;
    $jobs[0]['g'] = 0;
    $jobs[0]['b'] = 123;
    
    $jobs[0]['job']     = "filter";
    $jobs[0]['filter']  = "brightness";
    $jobs[0]['brightness'] = 80;
      
    $jobs[0]['job']     = "filter";
    $jobs[0]['filter']  = "contrast"; 
    $jobs[0]['contrast'] = 50;
    
    $jobs[0]['job']     = "filter";
    $jobs[0]['filter']  = "edgedetect"; 
    
    $jobs[0]['job']     = "filter";
    $jobs[0]['filter']  = "emboss"; 
    
    $jobs[0]['job']     = "filter";
    $jobs[0]['filter']  = "gaussian_blur"; 
    
    $jobs[0]['job']     = "filter";
    $jobs[0]['filter']  = "selective_blur"; 
    
    $jobs[0]['job']     = "filter";
    $jobs[0]['filter']  = "smooth";
    $jobs[0]['smooth']  = -6; /-8 - 8/

    $jobs[0]['job']     = "filter";
    $jobs[0]['filter']  = "negate";
    
    $jobs[0]['job']     = "filter";
    $jobs[0]['filter']  = "mean_removal";    
    
    $jobs[0]['job']     = "filter";
    $jobs[0]['filter']  = "grayscale";
    

    
    Error codes:
    x0000: error: settings or jobs are not set
    x0001: error: image not found
    x0002: image is a null ->no image left /* too many crops */
    x0003: error in arg list