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  Classes of Uku-Kaarel Jo~esaar  >  My Image Filter  >  function.ImageConvolution_.php  >  Download  
File: function.ImageConvolution_.php
Role: Auxiliary script
Content type: text/plain
Description: function.ImageConvolution_.php
Class: My Image Filter
Apply several types of effects on images
Author: By
Last change: IMG_FILTER_FUZZY_FRAME
IMG_FILTER_RASTERIZE ==
IMG_FILTER_PIXELATE (PHP 5.3 comp)
fix: set_time_limit( 0 )
Date: 5 years ago
Size: 34,095 bytes
 

Contents

Class file image Download
<?php

/** 
 * Native PHP ImageConvolution() for PHP4, based on PHP5.1.4 GD lib C source
 * 2006-11-30; 2009-03-24
 * 
 * (PHP 4 >= 4.3.2, PHP 5)
 *
 * @author ukjpriee@ukj.pri.ee ; http://ukj.pri.ee
 * @param resource $src Image
 * @param array $filter 3x3
 * @param float $filter_div
 * @param float $offset
 * @return bool
 */

 
function ImageConvolution_(&$src, $filter, $filter_div, $offset) {

	if (is_resource($src)===FALSE) return FALSE;
	
	if( ( count($filter)+count($filter[0])+
		  count($filter[1])+ count($filter[2]) ) !=12 ) return FALSE;

	if( function_exists('imageconvolution')===TRUE ) {
		// PHP 5
		return imageconvolution($src, $filter, $filter_div, $offset);
	}

	$srcsx = imagesx( $src );	$srcsy = imagesy( $src ); 
	$srcsx_m1 = $srcsx - 1;  	$srcsy_m1 = $srcsy - 1;
	
	/* We need the orinal image with each safe neoghb. pixel */
	$srcback = imagecreatetruecolor($srcsx, $srcsy); // PHP 4.0.6
	ImageCopy($srcback, $src,0,0,0,0,$srcsx,$srcsy);

	if ($srcback==NULL) return 0;
	
	set_time_limit ( 0 );
	
	for ( $y=0; $y<$srcsy; $y++) {
		for($x=0; $x<$srcsx; $x++) {
			$new_r = $new_g = $new_b = 0;
			/////////////////////////////////////////
			$x_m1 = $x-1;
			$y_m1 = $y-1;
			for ($j=0; $j<3; $j++) {
				$yv = min(max($y_m1 + $j, 0), $srcsy_m1);
				for ($i=0; $i<3; $i++) {
					$a = imagecolorsforindex($srcback, 
						ImageColorAt($srcback, min(max($x_m1 + $i, 0), $srcsx_m1 ),$yv ) );
					$new_r += $a['red']   * $filter[$j][$i];
					$new_g += $a['green'] * $filter[$j][$i];
					$new_b += $a['blue']  * $filter[$j][$i];
				}
			}			
			/////////////////////////////////////////
			$new_r = ($new_r/$filter_div)+$offset;
			$new_g = ($new_g/$filter_div)+$offset;
			$new_b = ($new_b/$filter_div)+$offset;
			
			$new_r=$new_r&255;// if($new_r > 255)$new_r = 255;elseif($new_r < 0)$new_r = 0;
			$new_g=$new_g&255;// if($new_g > 255)$new_g = 255;elseif($new_g < 0)$new_g = 0;
			$new_b=$new_b&255;// if($new_b > 255)$new_b = 255;elseif($new_b < 0)$new_b = 0;
			
			
			imagesetpixel ( $src, $x, $y, 
				imagecolorresolvealpha ( $src, $new_r, $new_g, $new_b, $a['alpha'] ) );// PHP 4.0.6
		}
	}
	ImageDestroy($srcback);
	return 1;
}




if( !defined('IMG_FILTER_NEGATE') )         define('IMG_FILTER_NEGATE',         0);
if( !defined('IMG_FILTER_GRAYSCALE') )      define('IMG_FILTER_GRAYSCALE',      1);
if( !defined('IMG_FILTER_BRIGHTNESS') )     define('IMG_FILTER_BRIGHTNESS',     2);
if( !defined('IMG_FILTER_CONTRAST') )       define('IMG_FILTER_CONTRAST',       3);
if( !defined('IMG_FILTER_COLORIZE') )       define('IMG_FILTER_COLORIZE',       4);
if( !defined('IMG_FILTER_EDGEDETECT') )     define('IMG_FILTER_EDGEDETECT',     5);
if( !defined('IMG_FILTER_EMBOSS') )         define('IMG_FILTER_EMBOSS',         6);
if( !defined('IMG_FILTER_GAUSSIAN_BLUR') )  define('IMG_FILTER_GAUSSIAN_BLUR',  7);
if( !defined('IMG_FILTER_SELECTIVE_BLUR') ) define('IMG_FILTER_SELECTIVE_BLUR', 8);
if( !defined('IMG_FILTER_MEAN_REMOVAL') )   define('IMG_FILTER_MEAN_REMOVAL',   9);
if( !defined('IMG_FILTER_SMOOTH') )         define('IMG_FILTER_SMOOTH',         10);
if( !defined('IMG_FILTER_RASTERIZE') )      define('IMG_FILTER_RASTERIZE',      21);
if( !defined('IMG_FILTER_PIXELATE') )       define('IMG_FILTER_PIXELATE',       21);

if( !defined('IMG_FILTER_TINT') )           define('IMG_FILTER_TINT',           11);
if( !defined('IMG_FILTER_RASTER_LINES') )   define('IMG_FILTER_RASTER_LINES',   12);
if( !defined('IMG_FILTER_BAYER') )          define('IMG_FILTER_BAYER',          13);
if( !defined('IMG_FILTER_CONTURES') )       define('IMG_FILTER_CONTURES',       14);
if( !defined('IMG_FILTER_JITTERING') )      define('IMG_FILTER_JITTERING',      15);
if( !defined('IMG_FILTER_POLARIZE') )       define('IMG_FILTER_POLARIZE',       16);
if( !defined('IMG_FILTER_REFRACTOR') )      define('IMG_FILTER_REFRACTOR',      17);
if( !defined('IMG_FILTER_COLOR_THRESHOLD') )define('IMG_FILTER_COLOR_THRESHOLD',18);
if( !defined('IMG_FILTER_CARTOONIZE') )     define('IMG_FILTER_CARTOONIZE',     19);
if( !defined('IMG_FILTER_THRESHOLD') )      define('IMG_FILTER_THRESHOLD',      20);
if( !defined('IMG_FILTER_OLIFY') )          define('IMG_FILTER_OLIFY'  ,        22);
if( !defined('IMG_FILTER_PASTEL') )         define('IMG_FILTER_PASTEL',         23);
if( !defined('IMG_FILTER_WATERCOLOR') )     define('IMG_FILTER_WATERCOLOR',     24);
if( !defined('IMG_FILTER_ROTOZOOM') )       define('IMG_FILTER_ROTOZOOM',       25);
if( !defined('IMG_FILTER_MIRRORED_FRAME') ) define('IMG_FILTER_MIRRORED_FRAME', 26);
if( !defined('IMG_FILTER_TEXTURED_FRAME') ) define('IMG_FILTER_TEXTURED_FRAME', 27);
if( !defined('IMG_FILTER_FUZZY_FRAME') )    define('IMG_FILTER_FUZZY_FRAME',    28);
/**
 * Applies a filter to an image
 *  PHP 4.0.6 > imagecolorresolvealpha()
 *  PHP 4.0.6 > imagecopyresampled()
 *  PHP 4.2.0 > fmod()
 * 
 * 
 * IMG_FILTER_NEGATE:         Reverses all colors of the image. 
 * IMG_FILTER_GRAYSCALE:      Converts the image into grayscale. 
 * IMG_FILTER_BRIGHTNESS:     Changes the brightness of the image. Use arg1 
 *                            to set the level of brightness. 
 * IMG_FILTER_CONTRAST:       Changes the contrast of the image. Use arg1 
 *                            to set the level of contrast. 
 * IMG_FILTER_COLORIZE:       Like IMG_FILTER_GRAYSCALE, except you can 
 *                            specify the color. Use arg1, arg2 and arg3 in 
 *                            the form of red, blue, green. The range for 
 *                            each color is 0 to 255. 
 * IMG_FILTER_EDGEDETECT:     Uses edge detection to highlight the edges in the image. 
 * IMG_FILTER_EMBOSS:         Embosses the image. 
 * IMG_FILTER_GAUSSIAN_BLUR:  Blurs the image using the Gaussian method. 
 * IMG_FILTER_SELECTIVE_BLUR: Blurs the image. 
 * IMG_FILTER_MEAN_REMOVAL:   Uses mean removal to achieve a \"sketchy\" effect. 
 * IMG_FILTER_SMOOTH:         Makes the image smoother. Use arg1 to set the 
 *                            level of smoothness. 
 * 
 * IMG_FILTER_TINT            Like IMG_FILTER_COLORIZE except you can use 
 *                            (float) arg4 to set the intensive factor 
 *                            0.0-1.0. Default is 0.25.
 * IMG_FILTER_PIXELATE
 * IMG_FILTER_RASTERIZE       Rasterize the image. Use (int) arg1 to 
 *                            set block size in pixels, default is 127.
 * IMG_FILTER_RASTER_LINES    Colored raster lines. Use (int) arg1 0-255 to 
 *                            set the level of threshold. Default is 127.
 * IMG_FILTER_BAYER           RGB bayer pattern simulation.
 * IMG_FILTER_CONTURES        Black conture lines and white backround.
 *                            (int) $arg1: amount 0-100; (int) $arg2: line 
 *                            width; (bool) $arg3: white background.
 * IMG_FILTER_JITTERING       Use (int) arg1 1-100 to set amount. Default is 3.
 * IMG_FILTER_POLARIZE        
 * IMG_FILTER_REFRACTOR       Use (int) arg1 to set pattern size. Default is 20.
 * IMG_FILTER_COLOR_THRESHOLD Use (int) arg1 to set maximum colors. Default id 64.
 * IMG_FILTER_CARTOONIZE      Converst the image into cartoon like look.
 * IMG_FILTER_THRESHOLD       Convert the image B/W look. Use (int) arg1 
 *                            0-255 to set threshold level. Default is 127.
 * IMG_FILTER_OLIFY           Olify the image. Use (int) arg1 1-20 to set 
 *                            amount. Default is 2.
 * IMG_FILTER_PASTEL          Convert the image drawed with pastels look.
 *                            Use (int) arg1 1-20 to set amount. Default is 2.
 * IMG_FILTER_WATERCOLOR      Convert the image painted with watercolors look.
 * IMG_FILTER_ROTOZOOM        Rotate and zoom. Use (float) arg1 0-360 to set 
 *                            angle and (float) arg2 0.0-10.0 to set zoom,
 *                            otherwise defaults used(45/1.6).
 * IMG_FILTER_MIRRORED_FRAME  Draw frame over the image. Use (int) arg1 to 
 *                            set borser width.
 * IMG_FILTER_TEXTURED_FRAME  Draw image-textured frame over the image.
 * IMG_FILTER_FUZZY_FRAME     Draw light & fuzzy image-textured frame over the image
 *
 * @author ukjpriee@ukj.pri.ee ; http://ukj.pri.ee
 * @param resource $src_im
 * @param int $filtertype
 * @param mixed $arg1
 * @param mixed $arg2
 * @param mixed $arg3
 * @param mixed $arg4
 * @return bool
 */ 
function imagefilter_ ( &$src_im, $filtertype=0, $arg1=0, $arg2=0, $arg3=0, $arg4=0 ) {
	if (!is_resource($src_im)) return 0;
	
	$srcsx = imagesx( $src_im ); $srcsy = imagesy( $src_im );
	
	switch( $filtertype ) {
	case IMG_FILTER_NEGATE: {
		if( function_exists('imagefilter')===TRUE )
			// PHP 5
			return imagefilter( $src_im, IMG_FILTER_NEGATE );
		
		for ($y = 0; $y<$srcsy;$y++){
			for ($x = 0; $x<$srcsx;$x++){
				$a = imagecolorsforindex($src_im, ImageColorAt($src_im, $x,$y ) );
				$color = imagecolorresolvealpha($src_im,
					255 - $a['red'],255 - $a['green'],255 - $a['blue'], $a['alpha'] );
				imagesetpixel ( $src_im, $x, $y, $color );
				
			}
		}
		break;
	}
	case IMG_FILTER_GRAYSCALE: {
		
		if($arg1>=256 or $arg1==0) {
			if( function_exists('imagefilter')===TRUE )
				return imagefilter( $src_im, IMG_FILTER_GRAYSCALE );
			$arg1=256;
		}
		
		if($arg1<3)$arg1=2; $m=round(256/$arg1); // astme suurus
		
		for($y=0;$y<$srcsy;$y++) {
			for($x=0;$x<$srcsx;$x++) {
				$a=imagecolorsforindex($src_im, ImageColorAt($src_im, $x,$y ) );
				$r = round( 0.299*$a['red'] + 0.587*$a['green'] + 0.114*$a['blue'] );
				
				if( $arg1<3 ) {
					if($r>=127) $r=255; else $r=0;
				} else
					// fmod() 4.2.0
					$r = abs( $r - fmod($r,$m) );
				
				imagesetpixel($src_im,$x,$y, 
					imagecolorresolvealpha($src_im,$r,$r,$r,$a['alpha'] ) );
			}
		}
		break;
	}
	case IMG_FILTER_BRIGHTNESS: {
		if( function_exists('imagefilter')===TRUE )
			return imagefilter( $src_im, IMG_FILTER_BRIGHTNESS,$arg1 );
		
		for ($y = 0; $y<$srcsy;$y++){
			for ($x = 0; $x<$srcsx;$x++){
				$a = imagecolorsforindex($src_im, ImageColorAt($src_im, $x,$y ) );
				
				$a['red']   += $arg1;
				$a['green'] += $arg1;
				$a['blue']  += $arg1;
				
				if($a['red']  <0)$a['red']  =0; elseif($a['red']  >255)$a['red']  =255;
				if($a['green']<0)$a['green']=0; elseif($a['green']>255)$a['green']=255;
				if($a['blue'] <0)$a['blue'] =0; elseif($a['blue'] >255)$a['blue'] =255;
				
				// PHP 4.0.6
				$color = imagecolorresolvealpha($src_im,
					$a['red'],$a['green'],$a['blue'], $a['alpha'] );
				imagesetpixel ( $src_im, $x, $y, $color );
				
			}
		}
		break;
	}	
	case IMG_FILTER_CONTRAST: {
		if( function_exists('imagefilter')===TRUE )
			return imagefilter( $src_im, IMG_FILTER_CONTRAST,$arg1 );
		
		$contrast =& $arg1;
		$contrast = (100.0-$contrast)/100.0;
		$contrast = $contrast*$contrast;

		for ($y = 0; $y<$srcsy;$y++){
			for ($x = 0; $x<$srcsx;$x++){
				$a = imagecolorsforindex($src_im, ImageColorAt($src_im, $x,$y ) );
				
				$a['red'] = $a['red']/255.0;
				$a['red'] = $a['red']-0.5;
				$a['red'] = $a['red']*$contrast;
				$a['red'] = $a['red']+0.5;
				$a['red'] = $a['red']*255.0;

				$a['green'] = $a['green']/255.0;
				$a['green'] = $a['green']-0.5;
				$a['green'] = $a['green']*$contrast;
				$a['green'] = $a['green']+0.5;
				$a['green'] = $a['green']*255.0;

				$a['blue'] = $a['blue']/255.0;
				$a['blue'] = $a['blue']-0.5;
				$a['blue'] = $a['blue']*$contrast;
				$a['blue'] = $a['blue']+0.5;
				$a['blue'] = $a['blue']*255.0;
				
				if($a['red']  <0)$a['red']  =0; elseif($a['red']  >255)$a['red']  =255;
				if($a['green']<0)$a['green']=0; elseif($a['green']>255)$a['green']=255;
				if($a['blue'] <0)$a['blue'] =0; elseif($a['blue'] >255)$a['blue'] =255;
				
				// PHP 4.0.6
				imagesetpixel ( $src_im, $x, $y, 
					imagecolorresolvealpha($src_im,
						$a['red'],$a['green'],$a['blue'],$a['alpha'] ) );
				
			}
		}
		break;
		
	}
	case IMG_FILTER_COLORIZE: {

		if( function_exists('imagefilter')===TRUE )
			return imagefilter( $src_im, IMG_FILTER_COLORIZE, $arg1, $arg2, $arg3 );
		
		$red    = $arg1;
		$green  = $arg2;
		$blue   = $arg3;
		
		for($y=0;$y<$srcsy;$y++) {
			for($x=0;$x<$srcsx;$x++) {
				
				$a = imagecolorsforindex($src_im, ImageColorAt($src_im, $x,$y ) );
				
				$a['red']   += $red;
				$a['green'] += $green;
				$a['blue']  += $blue;
				
				if($a['red']  <0)$a['red']  =0; elseif($a['red']  >255)$a['red']  =255;
				if($a['green']<0)$a['green']=0; elseif($a['green']>255)$a['green']=255;
				if($a['blue'] <0)$a['blue'] =0; elseif($a['blue'] >255)$a['blue'] =255;
				
				imagesetpixel ( $src_im, $x, $y,
					imagecolorresolvealpha($src_im, $a['red'],$a['green'],$a['blue'], $a['alpha'] ) );
				
			}
		}
		
		break;
	}
	case IMG_FILTER_EDGEDETECT: {
		if( function_exists('imagefilter')===TRUE )
			return imagefilter( $src_im, IMG_FILTER_EDGEDETECT );
		
		$kernel = array (array( -1.0, 0.0, -1.0),
				 array(  0.0, 4.0,  0.0),
				 array( -1.0, 0.0, -1.0));
		ImageConvolution_($src_im, $kernel, 1, 127);
		break;
	}
	case IMG_FILTER_EMBOSS: {
		if( function_exists('imagefilter')===TRUE )
			return imagefilter( $src_im, IMG_FILTER_EMBOSS );
			
		$kernel = array (array( 1.5, 0.0, 0.0),
				 array( 0.0, 0.0, 0.0),
				 array( 0.0, 0.0,-1.5));
				 
		ImageConvolution_($src_im, $kernel, 1, 127);
		break;
	}
	case IMG_FILTER_GAUSSIAN_BLUR: {
		if( function_exists('imagefilter')===TRUE )
			return imagefilter( $src_im, IMG_FILTER_GAUSSIAN_BLUR );
			
		$kernel = array (array( 1.0, 2.0, 1.0),
				 array( 2.0, 4.0, 2.0),
				 array( 1.0, 2.0, 1.0));
		ImageConvolution_($src_im, $kernel, 16, 0);
		break;
	}
	case IMG_FILTER_SELECTIVE_BLUR: {
		if( function_exists('imagefilter')===TRUE )
			return imagefilter( $src_im, IMG_FILTER_SELECTIVE_BLUR );
			
		/* We need the orinal image with each safe neoghb. pixel */
		$srcback = imagecreatetruecolor($srcsx, $srcsy);
		if ($srcback==NULL) return 0;
		ImageCopy($srcback, $src_im,0,0,0,0,$srcsx,$srcsy);
		
		$srcsxe=$srcsx-1;
		$srcsye=$srcsx-1;
		$a = array('red'=>0,'green'=>0,'green'=>0,'alpha'=>0);
		
		for ($y = 1; $y<$srcsye;$y++){
			for ($x = 1; $x<$srcsxe;$x++){
				$a0 = imagecolorsforindex($srcback, ImageColorAt($srcback, $x,$y ) );
				$a1 = imagecolorsforindex($srcback, ImageColorAt($srcback, $x+1,$y   ) );
				$a2 = imagecolorsforindex($srcback, ImageColorAt($srcback, $x+1,$y+1 ) );
				$a3 = imagecolorsforindex($srcback, ImageColorAt($srcback, $x  ,$y+1 ) );
				$a4 = imagecolorsforindex($srcback, ImageColorAt($srcback, $x-1,$y+1 ) );
				$a5 = imagecolorsforindex($srcback, ImageColorAt($srcback, $x-1,$y   ) );
				$a6 = imagecolorsforindex($srcback, ImageColorAt($srcback, $x-1,$y-1 ) );
				$a7 = imagecolorsforindex($srcback, ImageColorAt($srcback, $x  ,$y-1 ) );
				$a8 = imagecolorsforindex($srcback, ImageColorAt($srcback, $x+1,$y-1 ) );
				
				$a['red']   = ( 
					$a0['red']   + $a1['red']   + $a2['red']   + $a3['red']   + $a4['red']   + 
					$a5['red']   + $a6['red']   + $a7['red']   + $a8['red']   )  /9;

				$a['green'] = ( 
					$a0['green'] + $a1['green'] + $a2['green'] + $a3['green'] + $a4['green'] + 
					$a5['green'] + $a6['green'] + $a7['green'] + $a8['green'] )  /9;
				
				$a['blue']  = ( 
					$a0['blue']  + $a1['blue']  + $a2['blue']  + $a3['blue']  + $a4['blue']  + 
					$a5['blue']  + $a6['blue']  + $a7['blue']  + $a8['blue']  )  /9;
				
				$a['red']  =$a['red']  &255;
				$a['green']=$a['green']&255;
				$a['blue'] =$a['blue'] &255;
				
				$color = imagecolorresolvealpha($src_im,
					$a['red'],$a['green'],$a['blue'], $a0['alpha'] );
				imagesetpixel ( $src_im, $x, $y, $color );
				
			}
		}
		
		break;
	}
	case IMG_FILTER_MEAN_REMOVAL: {
		
		if( function_exists('imagefilter')===TRUE ) {
			return imagefilter( $src_im, IMG_FILTER_MEAN_REMOVAL );
		}
		$kernel = array (array( -1.0, -1.0, -1.0),
				 array( -1.0,  9.0, -1.0),
				 array( -1.0, -1.0, -1.0));
		ImageConvolution_($src_im, $kernel, 1, 0);
		
		break;
	}
	case IMG_FILTER_SMOOTH: {
		if( function_exists('imagefilter') ) {
			return imagefilter( $src_im, IMG_FILTER_SMOOTH,$arg1 );
		}
		
		$weight = $arg1;
		$kernel = array
				(array(1.0,1.0    ,1.0),
				 array(1.0,$weight,1.0),
				 array(1.0,1.0    ,1.0));
		ImageConvolution_($src_im, $kernel, $weight+8, 0);
		break;
	}

	case IMG_FILTER_TINT: {
		if($arg4==0) return TRUE;
		$red    = $arg1;
		$green  = $arg2;
		$blue   = $arg3;
		$intens = $arg4; if($intens==0)$intens = 0.25;
		if($intens<0.0)$intens=0.0;elseif($intens>1.0)$intens=1.0;
		
		for($y=0;$y<$srcsy;$y++) {
			for($x=0;$x<$srcsx;$x++) {
				
				$a = imagecolorsforindex($src_im, ImageColorAt($src_im, $x,$y ) );
				
				$dif_r = abs($a['red']  -$red);
				$dif_g = abs($a['green']-$green);
				$dif_b = abs($a['blue'] -$blue);
				
				    if($a['red']  <$red)   $a['red']   += ($dif_r*$intens); 
				elseif($a['red']  >$red)   $a['red']   -= ($dif_r*$intens);
					if($a['green']<$green) $a['green'] += ($dif_g*$intens);
				elseif($a['green']>$green) $a['green'] -= ($dif_g*$intens);
				    if($a['blue'] <$blue)  $a['blue']  += ($dif_b*$intens);
				elseif($a['blue'] >$blue)  $a['blue']  -= ($dif_b*$intens);
					
				if($a['red']  <0)$a['red']  =0; elseif($a['red']  >255)$a['red']  =255;
				if($a['green']<0)$a['green']=0; elseif($a['green']>255)$a['green']=255;
				if($a['blue'] <0)$a['blue'] =0; elseif($a['blue'] >255)$a['blue'] =255;
				
				imagesetpixel ( $src_im, $x, $y,
					imagecolorresolvealpha($src_im, $a['red'],$a['green'],$a['blue'], $a['alpha'] ) );
				
			}
		}
		
		break;
	}
	case IMG_FILTER_RASTER_LINES: {
		$Threshold =& $arg1;
		if($Threshold==0)$Threshold=127;
		
		$black = imagecolorallocate( $src_im, 0, 0, 0 );
		$white = imagecolorallocate( $src_im , 255, 255, 255 );
		$tmp_sw=$black;
		for ($y=0; $y<$srcsy;$y+=2) {
			
			if($tmp_sw==$black) {
				$tmp_sw=$white;
				imageline( $src_im , 0, $y , $srcsx ,$y , $tmp_sw );
			}
			elseif($tmp_sw==$white) $tmp_sw=$black;
			
			for ($x=0; $x<$srcsx;$x++) {
				
				$a = imagecolorsforindex($src_im, ImageColorAt($src_im, $x,$y ) );
				$i = round( 0.299*$a['red'] + 0.587*$a['green'] + 0.114*$a['blue'] );
				
				if ( $i >= $Threshold ) $c=$white; elseif ( $i < $Threshold ) $c=$black;
				
				imagesetpixel ( $src_im, $x, $y, $c );
				
			}
			
		}
		break;
	}
	case IMG_FILTER_BAYER: {
		for( $y=0; $y<$srcsy;$y++ ) {
			for( $x=0; $x<$srcsx;$x++ ) {
				$a = imagecolorsforindex($src_im, ImageColorAt($src_im, $x,$y ) );

				if (fmod($y,2)==0)
					if (fmod($x,2)==0) $a['red']   = $a['blue']=0;
					else               $a['green'] = $a['blue']=0;
				else
					if (fmod($x,2)==0) $a['red'] = $a['green']=0;
					else               $a['red'] = $a['blue'] =0;
				
				imagesetpixel ( $src_im, $x, $y, 
					imagecolorresolvealpha ( $src_im, $a['red'], $a['green'], $a['blue'], $a['alpha'] ) );
			}
		}
		break;
	}
	case IMG_FILTER_JITTERING: {
		$amount = $arg1;
		if($amount==0)$amount = 3;
		elseif($amount>100)$amount=100;
		
		for ($y = 0; $y<$srcsy; ++$y) {
			for ($x = 0; $x<$srcsx;++$x) {
				
				$nx=$x+(rand(0,$amount))*$amount;
				$ny=$y+(rand(0,$amount))*$amount;
				if($nx>=$srcsx)$nx=$x-rand(3,6);
				if($ny>=$srcsy)$ny=$y-rand(3,6);
				
				$a = imagecolorsforindex($src_im, ImageColorAt($src_im, $nx,$ny ) );
				
				imagesetpixel ( $src_im, $x, $y,
					imagecolorresolvealpha($src_im,
						$a['red'],$a['green'],$a['blue'], $a['alpha'] ) );
			}
		}
		break;
	}	
  	case IMG_FILTER_POLARIZE: {
		$Ye0 = $srcsy - 2;
		$Ye1 = $srcsy - 3;
		$Ye2 = $srcsy - 1;
		for ($y = 5; $y<$srcsy; $y += 4) {
			for ($x = 0; $x<$srcsx;++$x) {
				
				if($y<$Ye0) {
				
					$a = imagecolorsforindex($src_im, 
						ImageColorAt($src_im, $x-2,$y+2 ) );
					
					$a['red']   -=30;
					$a['green'] -=30;
					$a['blue']  +=60;
					
					if($a['red']  <0)$a['red']  =0; elseif($a['red']  >255)$a['red']  =255;
					if($a['green']<0)$a['green']=0; elseif($a['green']>255)$a['green']=255;
					if($a['blue'] <0)$a['blue'] =0; elseif($a['blue'] >255)$a['blue'] =255;
					
					imagesetpixel ( $src_im, $x+2, $y-2, 
						imagecolorresolvealpha($src_im, 
							$a['red'],$a['green'],$a['blue'], $a['alpha'] ) );
				
				}
				
				if($y<$Ye1) {
				
					$a = imagecolorsforindex($src_im,
						ImageColorAt($src_im, $x+1,$y+3 ) );
					
					$a['red']   -=30;
					$a['green'] +=60;
					$a['blue']  -=30;
					
					if($a['red']  <0)$a['red']  =0; elseif($a['red']  >255)$a['red']  =255;
					if($a['green']<0)$a['green']=0; elseif($a['green']>255)$a['green']=255;
					if($a['blue'] <0)$a['blue'] =0; elseif($a['blue'] >255)$a['blue'] =255;
					
					imagesetpixel ( $src_im, $x, $y-2, 
						imagecolorresolvealpha($src_im, 
							$a['red'],$a['green'],$a['blue'], $a['alpha'] ) );
				
				}
				
				if($y<$Ye2) {
					$a = imagecolorsforindex($src_im,
						ImageColorAt($src_im, $x+2,$y+1 ) );
					
					$a['red']   +=60;
					$a['green'] -=30;
					$a['blue']  -=30;
					
					if($a['red']  <0)$a['red']  =0; elseif($a['red']  >255)$a['red']  =255;
					if($a['green']<0)$a['green']=0; elseif($a['green']>255)$a['green']=255;
					if($a['blue'] <0)$a['blue'] =0; elseif($a['blue'] >255)$a['blue'] =255;
					
					imagesetpixel ( $src_im, $x-2, $y-1, 
						imagecolorresolvealpha($src_im, 
							$a['red'],$a['green'],$a['blue'], $a['alpha'] ) );

				}
				
			}
		}
		break;
	}	
	case IMG_FILTER_REFRACTOR: {
		$patternsize = $arg1;
		if($patternsize==0)$patternsize=20;
		elseif($patternize>$srcsx*2 or $patternize>$srcsy*2)$patternize = (($srcsx+$srcsy)/2)*2;
		
		$M = hypot($srcsx,$srcsy) / 2;

		for ($y = 0; $y<$srcsy;$y++ ) {
		  for ($x = 0; $x<$srcsx;$x++) {
		    
			$d1 = $x + fmod($x,($patternsize/255)*$M/2);
			$d2 = $y + fmod($y,($patternsize/255)*$M/2);
			
			if ($d1 >= $srcsx-1) $d1 = $srcsx-1;
		    if ($d2 >= $srcsy-1) $d2 = $srcsy-1;

			$a = imagecolorsforindex($src_im, ImageColorAt($src_im, $d1,$d2 ) );
			
			imagesetpixel ( $src_im, $x, $y, 
				imagecolorresolvealpha($src_im, 
					$a['red'],$a['green'],$a['blue'], $a['alpha'] ) );
			
		  }
		}
		break;
	}
	case IMG_FILTER_COLOR_THRESHOLD: {
		$level = ceil(sqrt($arg1));
		if($level==0)$level=12; if($level<3)$level=2; elseif($level>64)$level=64;
		
		////////////
		if($srcsx>$srcsy) { $pw=$level; $ph=ceil(($srcsy*$pw)/$srcsx);
		} else { $ph=$level; $pw=ceil(($srcsx*$ph)/$srcsy); }

		$tmpim = @imagecreatetruecolor($pw, $ph);
		@imagecopyresampled($tmpim,$src_im, 0,0,0,0, $pw, $ph,$srcsx, $srcsy );
		
		$impc = array(); // indexes, truecolors
		$impidxa = array('r'=>array(),'g'=>array(),'b'=>array(),'a'=>array()); // index color presentations

		for ($y = 0; $y<$ph;$y++) {
			for ($x = 0; $x<$pw;$x++) {

				$impidx = imagecolorsforindex($tmpim, ImageColorAt($tmpim, $x,$y ) );
				if( !in_array($impidx['red'],$impidxa['r']) )  $impidxa['r'][] = $impidx['red'];
				if( !in_array($impidx['green'],$impidxa['g']) )  $impidxa['g'][] = $impidx['green'];
				if( !in_array($impidx['blue'],$impidxa['b']) ) $impidxa['b'][] = $impidx['blue'];
				if( !in_array($impidx['alpha'],$impidxa['a']) ) $impidxa['a'][] = $impidx['alpha'];
				
			}
		}
		imagedestroy( $tmpim );
		asort($impidxa['r'], SORT_NUMERIC ); asort($impidxa['g'], SORT_NUMERIC ); 
		asort($impidxa['b'], SORT_NUMERIC ); asort($impidxa['a'], SORT_NUMERIC );
		//print_r( $impidxa );
		
		$chs = round( 256/pow(2, log($level,2)/3.125 ) ); 
		for ($y = 0; $y<$srcsy;$y++) {
			for ($x = 0; $x<$srcsx;$x++) {
				
				$a = imagecolorsforindex($src_im, ImageColorAt($src_im, $x,$y ) );

				foreach($impidxa['b'] as $impidxa_cb){
					if(  abs($impidxa_cb-$a['blue']) > abs(next($impidxa['b'])-$a['blue']) ) ;
					else { $a['blue']=$impidxa_cb; break; }
				}
				
				foreach($impidxa['g'] as $impidxa_cg){
					if(  abs($impidxa_cg-$a['green']) > abs(next($impidxa['g'])-$a['green']) ) ;
					else { $a['green']=$impidxa_cg; break; }
				}
				
				foreach($impidxa['r'] as $impidxa_cr){
					if(  abs($impidxa_cr-$a['red']) > abs(next($impidxa['r'])-$a['red']) ) ;
					else { $a['red']=$impidxa_cr; break; }
				}
				
				imagesetpixel ( $src_im, $x, $y, 
						imagecolorresolvealpha($src_im, 
								$a['red'],$a['green'],$a['blue'], $a['alpha'] ) );
					
			}
		}
		break;
	}
	case IMG_FILTER_CONTURES: {

		$amount = $arg1;
		if($amount<2)$amount=1; if($amount>100)$amount=100;
		$amount = abs(100-$amount);
		
		$a=$arg2; // line width
		if($a<2)$a=1; elseif($a>10)$a=10;
		
		
		$We = $srcsx -$a;
		$He = $srcsy -$a;
		$ax = $ay = $a;
		
		$black = imagecolorresolvealpha( $src_im, 0, 0, 0 ,0);
		
		$tmpim = @imagecreatetruecolor($srcsx,$srcsy);
		@imagecopy($tmpim,$src_im, 0,0,0,0,$srcsx,$srcsy); // oiget pidine
				
		$bw = (bool) $arg3; //white background
		if($bw) {
			$src_im = @imagecreatetruecolor($srcsx,$srcsy);
			$white = imagecolorresolve( $src_im, 255, 255, 255 );
			imagefill($src_im, 0,0,$white);
		}
		
		for ($y = 0; $y<$srcsy;$y++){
			$ax = $a;
			for ($x = 0; $x<$srcsx;$x++){
				
				$rgb0 = array_sum( imagecolorsforindex($tmpim, ImageColorAt($tmpim, $x,$y ) ) );
				
				if($y<$He) {
					$rgb2 = array_sum( imagecolorsforindex($tmpim, ImageColorAt($tmpim, $x,$y+$ay ) ) );
				}else {
					$ay=0;
					$rgb2 = array_sum( imagecolorsforindex($tmpim, ImageColorAt($tmpim, $x,$y-$ay ) ) );
				}
				
				
				if($x<$We) {
					$rgb1 = array_sum( imagecolorsforindex($tmpim, ImageColorAt($tmpim, $x+$ax,$y ) ) );
				} else { 
					$ax=0;
					$rgb1 = array_sum( imagecolorsforindex($tmpim, ImageColorAt($tmpim,$x-$ax,$y ) ) );
				}
					
				$rgb3 = array_sum( imagecolorsforindex($tmpim, ImageColorAt($tmpim, $x+$ax,$y+$ay ) ) );
				
				// BLACK LINE
				if( abs( $rgb0 - ($rgb1+$rgb2+$rgb3)/3 ) > $amount ) imagesetpixel($src_im,$x,$y,$black);
				
			}
		}
		break;
	}	
	case IMG_FILTER_CARTOONIZE: {

		imagefilter_( $src_im, IMG_FILTER_COLOR_THRESHOLD, 24 );
		
		$level=96; //color threshold
		$chs = round( 256/pow(2, log($level,2)/3.125 ) ); 
		
		$amount=20; //color sensitivity
		$amount = abs(100-$amount);
		
		$a=4; // line width
		$ad=3;
		
		$We = $srcsx -5;
		$He = $srcsy -5;
		$WeHe = 0;
		
		
		$black = imagecolorresolvealpha( $src_im, 0, 0, 0 ,0);
		
		set_time_limit ( 0 );
		
		for ($y = 0; $y<$srcsy;$y++){
			for ($x = 0; $x<$srcsx;$x++){
				
				$rgb = imagecolorsforindex($src_im, ImageColorAt($src_im, $x,$y ) );
				$rgb0 = array_sum( $rgb );
				
				
				if($x<$We) { 
					$rgb1 = array_sum( imagecolorsforindex($src_im, ImageColorAt($src_im, $x+$a,$y ) ) ); $WeHe=0; 
				} 
				else { $rgb1 = $rgb0; $WeHe=1; }
				
				if($y<$He) 
					$rgb2 = array_sum( imagecolorsforindex($src_im, ImageColorAt($src_im, $x,$y+$a ) ) );
				else { $rgb2 = $rgb0; $WeHe=1; }
				
				if( $WeHe == 0 )
					$rgb3 = array_sum( imagecolorsforindex($src_im, ImageColorAt($src_im, $x+$ad,$y+$ad ) ) );
				else $rgb3 = $rgb0;
				
				// BLACK LINE
				if( abs( $rgb0 - ($rgb1+$rgb2+$rgb3)/3 ) > $amount ) imagesetpixel($src_im,$x,$y,$black);
			}
		}
		break;
	}	
	case IMG_FILTER_THRESHOLD: {
		
		$Threshold = $arg1;
		if($Threshold==0)$Threshold=127;
		for ($y=0; $y<$srcsy;$y+=1) {
			for ($x=0; $x<$srcsx;$x++) {
				
				$a = imagecolorsforindex($src_im, ImageColorAt($src_im, $x,$y ) );
				$r = round( 0.299*$a['red'] + 0.587*$a['green'] + 0.114*$a['blue'] );
				//if($r > 1) $r--;else $r=0;
				if ( $r >= $Threshold ) $v=255; else $v=0;
				
				imagesetpixel ( $src_im, $x, $y, 
					imagecolorresolvealpha($src_im, $v,$v,$v, $a['alpha'] ) );
			}
			
		}
		break;
	}	
	case IMG_FILTER_PIXELATE:
	case IMG_FILTER_RASTERIZE: {
		
		$cell =(int) $arg1;
		if($cell<4)$cell=4;
		
		if( $arg2 ) $arg2 = TRUE; else $arg2 = FALSE;
		
		if( function_exists('imagefilter') ) {
			return imagefilter( $src_im, IMG_FILTER_PIXELATE, $cell, $arg2 );
		}
		
		elseif($cell>=$srcsx && $cell>=$srcsy) {
			$tmpim = @imagecreatetruecolor(1,1);
			imagecopyresampled($tmpim,$src_im, 0,0,0,0, 1,1, $srcsx,$srcsy);
			imagefilledrectangle ($src_im,0,0,$srcsx,$srcsy,ImageColorAt($tmpim,0,0));
			imagedestroy( $tmpim );
			break;
		}
		$p1w = ceil( $srcsx / $cell );
		$p1h = ceil( $srcsy / $cell );
		$tmpim = @imagecreatetruecolor($p1w, $p1h);
		imagecopyresampled($tmpim,$src_im, 0, 0, 0, 0, $p1w, $p1h, $srcsx, $srcsy);
		imagecopyresized($src_im,$tmpim, 0, 0, 0, 0, $srcsx, $srcsy,$p1w, $p1h);
		imagedestroy( $tmpim );
		
		break;
	}
	case IMG_FILTER_OLIFY: {
		$amount = $arg1; 
		if($amount<1)$amount = 2; elseif($amount>20)$amount = 20;
		
		for ($y = 0; $y<$srcsy; ++$y) {
			for ($x = 0; $x<$srcsx;++$x) {
				
				$nx=$x-(rand(0,$amount))*$amount;
				$ny=$y-(rand(0,$amount))*$amount;
				if($nx>$x)$nx=$x-1; if($nx<3)$nx=$x+rand(-2,2);
				if($ny>$y)$ny=$y-1; if($ny<3)$ny=$y+rand(-2,2);
				
				if(($ny-$y)>5)$ny=$y+5;
				if(($nx-$x)>5)$nx=$x+5;
				
				$a = imagecolorsforindex($src_im, ImageColorAt($src_im, $nx,$ny ) );
				
				imagesetpixel ( $src_im, $x, $y, 
					imagecolorresolvealpha($src_im,
						$a['red'],$a['green'],$a['blue'], $a['alpha'] ) );
			}
		}
		break;
	}	
	case IMG_FILTER_PASTEL: {
		$amount = $arg1;
		if($amount<1)$amount = 2; elseif($amount>10)$amount = 10;
		$amount /= 2;
		for ($y = 0; $y<$srcsy; ++$y) {
			for ($x = 0; $x<$srcsx;++$x) {
				
				$nx=$x-(rand(0-$amount,$amount));
				$ny=$y-(rand(0-$amount,$amount));
				
				if($nx>$x)$nx=$x+rand(0-$amount,$amount);
				if($ny>$y)$ny=$y+rand(0-$amount-5,$amount);
				
				if(($ny-$y)>5)$ny=$y+5;
				if(($nx-$x)>5)$nx=$x+5;
				
				$a = imagecolorsforindex($src_im, ImageColorAt($src_im, $nx,$ny ) );
				
				imagesetpixel ( $src_im, $x, $y, 
					imagecolorresolvealpha($src_im,
						$a['red'],$a['green'],$a['blue'], $a['alpha'] ) );
			}
		}
		break;
	}
	case IMG_FILTER_WATERCOLOR: {
	
		$tmpim = @imagecreatetruecolor($srcsx, $srcsy);
		
		$p1w = ( 90 * $srcsx ) /100;
		$p1h = ( 90 * $srcsy ) /100;
		@imagecopy($tmpim,$src_im, 0,0,0,0, $p1w, $p1h);
		
		imagefilter_( $src_im, IMG_FILTER_COLOR_THRESHOLD, 28 );
		set_time_limit ( 0 );
		
		imagefilter_( $src_im, IMG_FILTER_OLIFY, 1 );
		
		imagecopyresampled($tmpim,$src_im, 0, 0, 0, 0, $p1w, $p1h, $srcsx,$srcsy);
		imagecopyresampled($src_im,$tmpim, 0, 0, 0, 0,$srcsx,$srcsy,$p1w, $p1h);
		imagedestroy( $tmpim );
		break;
	}
	case IMG_FILTER_ROTOZOOM: {
		// rotozoom by Vincent 'MooZ' Cruz (vcruz@free.fr) (Artweaver, Lua scripting)
		$angle=$arg1; 
		if($angle<=0 or $angle>=360)$angle=0;
		$angle=deg2rad($angle);
		
		$zoom=$arg2; $zoom = $zoom<1.0?1.0: $zoom>10.0?10.0: $zoom;

		$rx=cos($angle)*$zoom;
		$ry=sin($angle)*$zoom;

		$u0=0; $v0=0; $u1=0; $v1=0;
		
		$tmpim = @imagecreatetruecolor($srcsx,$srcsy);
		@imagecopy($tmpim,$src_im, 0,0,0,0,$srcsx,$srcsy);
		
		for ($y=0; $y<$srcsy;$y++) {

			$u1=$u0; $v1=$v0;

			for ( $x=0; $x<$srcsx;$x++ ) {
				$u1=$u1+$rx;
				$v1=$v1+$ry;

				if($u1<0)
					$u=$srcsx-fmod(abs($u1),$srcsx);
				else
					$u=fmod($u1,$srcsx);
				

				if($v1<0)
					$v=$srcsy-fmod(abs($v1),$srcsx);
				else
					$v=fmod($v1,$srcsy);
				
				$a = imagecolorsforindex($tmpim, ImageColorAt($tmpim, $u,$v ) );
				
				imagesetpixel ( $src_im, $x, $y, 
					imagecolorresolvealpha($src_im, 
						$a['red'],$a['green'],$a['blue'], $a['alpha'] ) );
				
			}

			$u0=$u0-$ry; $v0=$v0+$rx;

		}
		break;
	}	
	case IMG_FILTER_MIRRORED_FRAME: {
		//mirrored_frame.lua
				
		$FrameSize = $arg1;
		if($FrameSize==0)$FrameSize=30;
		if($FrameSize > $srcsx/2 ) $FrameSize = $srcsx/2;
		if($FrameSize > $srcsy/2 ) $FrameSize = $srcsy/2;
		
		$tmpim = @imagecreatetruecolor($srcsx,$srcsy);
		@imagecopy($tmpim,$src_im, 0,0,0,0,$srcsx,$srcsy); // oiget pidine
		
		
		if( function_exists( 'imagerotate' )) {
			$src_im = imagerotate ( $src_im, 180,0 );
			return @imagecopyresampled($src_im,$tmpim, $FrameSize,$FrameSize,0,0,
				$srcsx-($FrameSize*2),$srcsy-($FrameSize*2),$srcsx,$srcsy);
		}
		
		for ($y=0; $y<$srcsy;$y++) {
			for ($x=0; $x<$srcsx;$x++) {
				
				$insideframe=0;
				if( ($x > $FrameSize) and ($x < $srcsx-$FrameSize-1) )
					if( ($y > $FrameSize) and ($y < $srcsy-$FrameSize-1) )$insideframe=1;
				
				if($insideframe==1)
					$a = imagecolorsforindex($tmpim, ImageColorAt($tmpim, $x,$y ) );
				else
					$a = imagecolorsforindex($tmpim, ImageColorAt($tmpim, $srcsx-$x,$srcsy-$y ) );
				
				imagesetpixel ( $src_im, $x, $y, 
					imagecolorresolvealpha($src_im, 
						$a['red'],$a['green'],$a['blue'], $a['alpha'] ) );
			}
		}
		break;
	}
	case IMG_FILTER_TEXTURED_FRAME: {
		
		if( $srcsx <= 16 or $srcsy <= 16) return $FrameSize = 4;
		elseif( $srcsx >= $srcsy )  $FrameSize = ceil($srcsx/10);
		else $FrameSize = ceil($srcsy/10);
		
		// copy for 
		$tmpim = @imagecreatetruecolor($srcsx,$srcsy);
		@imagecopy($tmpim,$src_im, 0,0,0,0,$srcsx,$srcsy); 
		
		// now original is dark
		imagefilter_( $src_im, IMG_FILTER_BRIGHTNESS, -127 );
		
		$black = imagecolorresolvealpha( $src_im, 0, 0, 0 ,0);
		
		
		for ($i=0; $i < $FrameSize; $i += 2) {
			imagerectangle($src_im, $i, $i, $srcsx-$i, $srcsy-$i, $black);
		}
		
		@imagecopy($src_im, $tmpim, $FrameSize,$FrameSize,$FrameSize,$FrameSize,$srcsx-($FrameSize*2),$srcsy-($FrameSize*2));
		
		break;
	}

	case IMG_FILTER_FUZZY_FRAME: { 
		if( $srcsx <= 16 or $srcsy <= 16) return $FrameSize = 4;
		elseif( $srcsx >= $srcsy )  $FrameSize = ceil($srcsx/10);
		else $FrameSize = ceil($srcsy/10);
		
		// copy for 
		$tmpim = @imagecreatetruecolor($srcsx,$srcsy);
		@imagecopy($tmpim,$src_im, 0,0,0,0,$srcsx,$srcsy);
	
		
		// now original is fuzzy
		imagefilter_( $src_im, IMG_FILTER_SELECTIVE_BLUR );
		imagefilter_( $src_im, IMG_FILTER_GAUSSIAN_BLUR );
		imagefilter_( $src_im, IMG_FILTER_BRIGHTNESS, 40 );
		
		if( function_exists('imagecolorallocatealpha')) 
			{ $darkalpha64 = imagecolorallocatealpha($src_im,180, 180, 180, 90 ); } 
		else { $darkalpha64 = imagecolorallocatealpha($src_im,180, 180, 180 ); }
		
		
		@imagecopy($src_im, $tmpim, $FrameSize,$FrameSize,$FrameSize,$FrameSize,$srcsx-($FrameSize*2)+1,$srcsy-($FrameSize*2)+1);
		
		imagerectangle($src_im, $FrameSize-1,$FrameSize-1, $srcsx-$FrameSize+1,$srcsy-$FrameSize+1, $darkalpha64);
		
		
		break;
	}
	
	
	} //end switch
	
	if( isset( $tmpim ) ) imagedestroy($tmpim);
	return TRUE;
}



?>