<?php

$src_image  = "smoking-woman";
$src_type   = ".jpg";
$quality    = 100;

switch($src_type)
{
    case '.jpeg':
    case  '.jpg':
        $image_create = "imagecreatefromjpeg";
        break;
    case  '.png':
        $image_create = "imagecreatefrompng";
        break;
    default:
        echo 'image type should be either .jpg or .png';
        exit;
}

switch($src_type)
{
    case '.jpeg':
    case  '.jpg':
        $image_out = "imagejpeg";
        break;
    case  '.png':
        $image_out = "imagepng";
        break;
    default:
        echo 'image type should be either .jpg or .png';
        exit;
}

if ($src_type == '.png')
{
    $quality = (int) ((100 - $quality) * (9 / 100));
}

$source = $image_create($src_image . $src_type);
imagealphablending($source, false);
imagesavealpha($source, true);

$source_width = imagesx($source);
$source_height = imagesy($source);

/********************************************/
/* start imageconvolution2 without negation */
/********************************************/
$new_image = $image_create($src_image . $src_type);
imagealphablending($new_image, false);
imagesavealpha($new_image, true);

/* these are the sobel matrices */
$mx = array(array( 1,  0, -1),
            array( 2,  0, -2),
            array( 1,  0, -1));

$my = array(array( 1,  2,  1),
            array( 0,  0,  0),
            array(-1, -2, -1));

echo 'Running image through imageconvolution2 without negation.... ';
echo imageconvolution2($new_image, $mx, $my, 1, 0) ? 'done OK' : 'done with ERRORS';
echo "\x0a";

$image_out($new_image, $src_image . "-imageconvolution2" . $src_type, $quality);

$combined = imagecreatetruecolor($source_width * 2, $source_height);
imagealphablending($combined, true);
imagesavealpha($combined, true);
$trans = imagecolorallocatealpha($combined, 0, 0, 0, 127);
imagefill($combined, 0, 0, $trans);
imagecopy($combined, $source, 0, 0, 0, 0, $source_width, $source_height);
imagecopy($combined, $new_image, $source_width, 0, 0, 0, $source_width, $source_height);

$image_out($combined, $src_image . "-imageconvolution2-combined" . $src_type, $quality);

imagedestroy($new_image);
imagedestroy($combined);
/* end imageconvolution2 without negation */


/*****************************************/
/* start imageconvolution2 with negation */
/*****************************************/
$new_image = $image_create($src_image . $src_type);
imagealphablending($new_image, false);
imagesavealpha($new_image, true);

echo 'Running image through imageconvolution2 with negation.... ';
echo imageconvolution2($new_image, $mx, $my, 1, 0, true) ? 'done OK' : 'done with ERRORS';
echo "\x0a";

$image_out($new_image, $src_image . "-imageconvolution2-negate" . $src_type, $quality);

$combined = imagecreatetruecolor($source_width * 2, $source_height);
imagealphablending($combined, true);
imagesavealpha($combined, true);
$trans = imagecolorallocatealpha($combined, 0, 0, 0, 127);
imagefill($combined, 0, 0, $trans);
imagecopy($combined, $source, 0, 0, 0, 0, $source_width, $source_height);
imagecopy($combined, $new_image, $source_width, 0, 0, 0, $source_width, $source_height);

$image_out($combined, $src_image . "-imageconvolution2-combined-negate" . $src_type, $quality);

imagedestroy($new_image);
imagedestroy($combined);
/* end imageconvolution2 with negation */


/*********************************************************/
/* start imagefilter IMG_FILTER_PREWITT without negation */
/*********************************************************/
$new_image = $image_create($src_image . $src_type);
imagealphablending($new_image, false);
imagesavealpha($new_image, true);

echo 'Running image through imagefilter with IMG_FILTER_PREWITT without negation.... ';
echo imagefilter($new_image, IMG_FILTER_PREWITT, false) ? 'done OK' : 'done with ERRORS';
echo "\x0a";

$image_out($new_image, $src_image . "-imagefilter-prewitt" . $src_type, $quality);

$combined = imagecreatetruecolor($source_width * 2, $source_height);
imagealphablending($combined, true);
imagesavealpha($combined, true);
$trans = imagecolorallocatealpha($combined, 0, 0, 0, 127);
imagefill($combined, 0, 0, $trans);
imagecopy($combined, $source, 0, 0, 0, 0, $source_width, $source_height);
imagecopy($combined, $new_image, $source_width, 0, 0, 0, $source_width, $source_height);

$image_out($combined, $src_image . "-imagefilter-prewitt-combined" . $src_type, $quality);

imagedestroy($new_image);
imagedestroy($combined);
/* end imagefilter IMG_FILTER_PREWITT without negation */



/******************************************************/
/* start imagefilter IMG_FILTER_PREWITT with negation */
/******************************************************/
$new_image = $image_create($src_image . $src_type);
imagealphablending($new_image, false);
imagesavealpha($new_image, true);

echo 'Running image through imagefilter with IMG_FILTER_PREWITT with negation.... ';
echo imagefilter($new_image, IMG_FILTER_PREWITT) ? 'done OK' : 'done with ERRORS';
echo "\x0a";

$image_out($new_image, $src_image . "-imagefilter-prewitt-negate" . $src_type, $quality);

$combined = imagecreatetruecolor($source_width * 2, $source_height);
imagealphablending($combined, true);
imagesavealpha($combined, true);
$trans = imagecolorallocatealpha($combined, 0, 0, 0, 127);
imagefill($combined, 0, 0, $trans);
imagecopy($combined, $source, 0, 0, 0, 0, $source_width, $source_height);
imagecopy($combined, $new_image, $source_width, 0, 0, 0, $source_width, $source_height);

$image_out($combined, $src_image . "-imagefilter-prewitt-combined-negate" . $src_type, $quality);

imagedestroy($new_image);
imagedestroy($combined);
/* end imagefilter IMG_FILTER_PREWITT with negation */

/********************************************************/
/* start imagefilter IMG_FILTER_SCHARR without negation */
/********************************************************/
$new_image = $image_create($src_image . $src_type);
imagealphablending($new_image, false);
imagesavealpha($new_image, true);

echo 'Running image through imagefilter with IMG_FILTER_SCHARR without negation.... ';
echo imagefilter($new_image, IMG_FILTER_SCHARR, false) ? 'done OK' : 'done with ERRORS';
echo "\x0a";

$image_out($new_image, $src_image . "-imagefilter-scharr" . $src_type, $quality);

$combined = imagecreatetruecolor($source_width * 2, $source_height);
imagealphablending($combined, true);
imagesavealpha($combined, true);
$trans = imagecolorallocatealpha($combined, 0, 0, 0, 127);
imagefill($combined, 0, 0, $trans);
imagecopy($combined, $source, 0, 0, 0, 0, $source_width, $source_height);
imagecopy($combined, $new_image, $source_width, 0, 0, 0, $source_width, $source_height);

$image_out($combined, $src_image . "-imagefilter-scharr-combined" . $src_type, $quality);

imagedestroy($new_image);
imagedestroy($combined);
/* end imagefilter IMG_FILTER_SCHARR */


/*****************************************************/
/* start imagefilter IMG_FILTER_SCHARR with negation */
/*****************************************************/
$new_image = $image_create($src_image . $src_type);
imagealphablending($new_image, false);
imagesavealpha($new_image, true);

echo 'Running image through imagefilter with IMG_FILTER_SCHARR with negation.... ';
echo imagefilter($new_image, IMG_FILTER_SCHARR) ? 'done OK' : 'done with ERRORS';
echo "\x0a";

$image_out($new_image, $src_image . "-imagefilter-scharr-negate" . $src_type, $quality);

$combined = imagecreatetruecolor($source_width * 2, $source_height);
imagealphablending($combined, true);
imagesavealpha($combined, true);
$trans = imagecolorallocatealpha($combined, 0, 0, 0, 127);
imagefill($combined, 0, 0, $trans);
imagecopy($combined, $source, 0, 0, 0, 0, $source_width, $source_height);
imagecopy($combined, $new_image, $source_width, 0, 0, 0, $source_width, $source_height);

$image_out($combined, $src_image . "-imagefilter-scharr-combined-negate" . $src_type, $quality);

imagedestroy($new_image);
imagedestroy($combined);
/* end imagefilter IMG_FILTER_SCHARR with negation */


/*******************************************************/
/* start imagefilter IMG_FILTER_SOBEL without negation */
/*******************************************************/
$new_image = $image_create($src_image . $src_type);
imagealphablending($new_image, false);
imagesavealpha($new_image, true);

echo 'Running image through imagefilter with IMG_FILTER_SOBEL without negation.... ';
echo imagefilter($new_image, IMG_FILTER_SOBEL, false) ? 'done OK' : 'done with ERRORS';
echo "\x0a";

$image_out($new_image, $src_image . "-imagefilter-sobel" . $src_type, $quality);

$combined = imagecreatetruecolor($source_width * 2, $source_height);
imagealphablending($combined, true);
imagesavealpha($combined, true);
$trans = imagecolorallocatealpha($combined, 0, 0, 0, 127);
imagefill($combined, 0, 0, $trans);
imagecopy($combined, $source, 0, 0, 0, 0, $source_width, $source_height);
imagecopy($combined, $new_image, $source_width, 0, 0, 0, $source_width, $source_height);

$image_out($combined, $src_image . "-imagefilter-sobel-combined" . $src_type, $quality);

imagedestroy($new_image);
imagedestroy($combined);
/* end imagefilter IMG_FILTER_SOBEL without negation */


/****************************************************/
/* start imagefilter IMG_FILTER_SOBEL with negation */
/****************************************************/
$new_image = $image_create($src_image . $src_type);
imagealphablending($new_image, false);
imagesavealpha($new_image, true);

echo 'Running image through imagefilter with IMG_FILTER_SOBEL with negation.... ';
echo imagefilter($new_image, IMG_FILTER_SOBEL) ? 'done OK' : 'done with ERRORS';
echo "\x0a";

$image_out($new_image, $src_image . "-imagefilter-sobel-negate" . $src_type, $quality);

$combined = imagecreatetruecolor($source_width * 2, $source_height);
imagealphablending($combined, true);
imagesavealpha($combined, true);
$trans = imagecolorallocatealpha($combined, 0, 0, 0, 127);
imagefill($combined, 0, 0, $trans);
imagecopy($combined, $source, 0, 0, 0, 0, $source_width, $source_height);
imagecopy($combined, $new_image, $source_width, 0, 0, 0, $source_width, $source_height);

$image_out($combined, $src_image . "-imagefilter-sobel-combined-negate" . $src_type, $quality);

imagedestroy($new_image);
imagedestroy($combined);
/* end imagefilter IMG_FILTER_SOBEL with negation */

?>