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- <?php
- //include this file whenever you have to use imageconvolution…
- //you can use in your project, but keep the comment below
- //great for any image manipulation library
- //Made by Chao Xu(Mgccl) 3/1/07
- //www.webdevlogs.com
- //V 1.0
- if (!function_exists('imagefilter')) {
- function imagefilter($source, $var, $arg1 = null, $arg2 = null, $arg3 = null) {
- #define(’IMAGE_FILTER_NEGATE’, 0);
- #define(’IMAGE_FILTER_GRAYSCALE’, 1);
- #define(’IMAGE_FILTER_BRIGHTNESS’, 2);
- #define(’IMAGE_FILTER_CONTRAST’, 3);
- #define(’IMAGE_FILTER_COLORIZE’, 4);
- #define(’IMAGE_FILTER_EDGEDETECT’, 5);
- #define(’IMAGE_FILTER_EMBOSS’, 6);
- #define(’IMAGE_FILTER_GAUSSIAN_BLUR’, 7);
- #define(’IMAGE_FILTER_SELECTIVE_BLUR’, 8);
- #define(’IMAGE_FILTER_MEAN_REMOVAL’, 9);
- #define(’IMAGE_FILTER_SMOOTH’, 10);
- $max_y = imagesy($source);
- $max_x = imagesx($source);
- switch ($var) {
- case 0:
- $y = 0;
- while ($y<$max_y) {
- $x = 0;
- while ($x<$max_x) {
- $rgb = imagecolorat($source, $x, $y);
- $r = 255 - (($rgb >> 16) & 0xFF);
- $g = 255 - (($rgb >> 8) & 0xFF);
- $b = 255 - ($rgb & 0xFF);
- $a = $rgb >> 24;
- $new_pxl = imagecolorallocatealpha($source, $r, $g, $b, $a);
- if ($new_pxl == false) {
- $new_pxl = imagecolorclosestalpha($source, $r, $g, $b, $a);
- }
- imagesetpixel($source, $x, $y, $new_pxl);
- ++$x;
- }
- ++$y;
- }
- return true;
- break;
- case 1:
- $y = 0;
- while ($y<$max_y) {
- $x = 0;
- while ($x<$max_x) {
- $rgb = imagecolorat($source, $x, $y);
- $a = $rgb >> 24;
- $r = ((($rgb >> 16) & 0xFF)*0.299)+((($rgb >> 8) & 0xFF)*0.587)+(($rgb & 0xFF)*0.114);
- $new_pxl = imagecolorallocatealpha($source, $r, $r, $r, $a);
- if ($new_pxl == false) {
- $new_pxl = imagecolorclosestalpha($source, $r, $r, $r, $a);
- }
- imagesetpixel($source, $x, $y, $new_pxl);
- ++$x;
- }
- ++$y;
- }
- return true;
- break;
- case 2:
- $y = 0;
- while ($y<$max_y) {
- $x = 0;
- while ($x<$max_x) {
- $rgb = imagecolorat($source, $x, $y);
- $r = (($rgb >> 16) & 0xFF) + $arg1;
- $g = (($rgb >> 8) & 0xFF) + $arg1;
- $b = ($rgb & 0xFF) + $arg1;
- $a = $rgb >> 24;
- $r = ($r > 255)? 255 : (($r < 0)? 0:$r);
- $g = ($g > 255)? 255 : (($g < 0)? 0:$g);
- $b = ($b > 255)? 255 : (($b < 0)? 0:$b);
- $new_pxl = imagecolorallocatealpha($source, $r, $g, $b, $a);
- if ($new_pxl == false) {
- $new_pxl = imagecolorclosestalpha($source, $r, $g, $b, $a);
- }
- imagesetpixel($source, $x, $y, $new_pxl);
- ++$x;
- }
- ++$y;
- }
- return true;
- break;
- case 3:
- $contrast = pow((100-$arg1)/100, 2);
- $y = 0;
- while ($y<$max_y) {
- $x = 0;
- while ($x<$max_x) {
- $rgb = imagecolorat($source, $x, $y);
- $a = $rgb >> 24;
- $r = (((((($rgb >> 16) & 0xFF)/255)-0.5)*$contrast)+0.5)*255;
- $g = (((((($rgb >> 8) & 0xFF)/255)-0.5)*$contrast)+0.5)*255;
- $b = ((((($rgb & 0xFF)/255)-0.5)*$contrast)+0.5)*255;
- $r = ($r > 255)? 255 : (($r < 0)? 0:$r);
- $g = ($g > 255)? 255 : (($g < 0)? 0:$g);
- $b = ($b > 255)? 255 : (($b < 0)? 0:$b);
- $new_pxl = imagecolorallocatealpha($source, $r, $g, $b, $a);
- if ($new_pxl == false) {
- $new_pxl = imagecolorclosestalpha($source, $r, $g, $b, $a);
- }
- imagesetpixel($source, $x, $y, $new_pxl);
- ++$x;
- }
- ++$y;
- }
- return true;
- break;
- case 4:
- $x = 0;
- while ($x<$max_x) {
- $y = 0;
- while ($y<$max_y) {
- $rgb = imagecolorat($source, $x, $y);
- $r = (($rgb >> 16) & 0xFF) + $arg1;
- $g = (($rgb >> 8) & 0xFF) + $arg2;
- $b = ($rgb & 0xFF) + $arg3;
- $a = $rgb >> 24;
- $r = ($r > 255)? 255 : (($r < 0)? 0:$r);
- $g = ($g > 255)? 255 : (($g < 0)? 0:$g);
- $b = ($b > 255)? 255 : (($b < 0)? 0:$b);
- $new_pxl = imagecolorallocatealpha($source, $r, $g, $b, $a);
- if ($new_pxl == false) {
- $new_pxl = imagecolorclosestalpha($source, $r, $g, $b, $a);
- }
- imagesetpixel($source, $x, $y, $new_pxl);
- ++$y;
- }
- ++$x;
- }
- return true;
- break;
- case 5:
- return imageconvolution($source, array(array(-1, 0, -1), array(0, 4, 0), array(-1, 0, -1)), 1, 127);
- break;
- case 6:
- return imageconvolution($source, array(array(1.5, 0, 0), array(0, 0, 0), array(0, 0, -1.5)), 1, 127);
- break;
- case 7:
- return imageconvolution($source, array(array(1, 2, 1), array(2, 4, 2), array(1, 2, 1)), 16, 0);
- break;
- case 8:
- for ($y = 0; $y<$max_y; $y++) {
- for ($x = 0; $x<$max_x; $x++) {
- $flt_r_sum = $flt_g_sum = $flt_b_sum = 0;
- $cpxl = imagecolorat($source, $x, $y);
- for ($j=0; $j<3; $j++) {
- for ($i=0; $i<3; $i++) {
- if (($j == 1) && ($i == 1)) {
- $flt_r[1][1] = $flt_g[1][1] = $flt_b[1][1] = 0.5;
- }
- else {
- $pxl = imagecolorat($source, $x-(3>>1)+$i, $y-(3>>1)+$j);
-
- $new_a = $pxl >> 24;
- //$r = (($pxl >> 16) & 0xFF);
- //$g = (($pxl >> 8) & 0xFF);
- //$b = ($pxl & 0xFF);
- $new_r = abs((($cpxl >> 16) & 0xFF) - (($pxl >> 16) & 0xFF));
- if ($new_r != 0) {
- $flt_r[$j][$i] = 1/$new_r;
- }
- else {
- $flt_r[$j][$i] = 1;
- }
- $new_g = abs((($cpxl >> 8) & 0xFF) - (($pxl >> 8) & 0xFF));
- if ($new_g != 0) {
- $flt_g[$j][$i] = 1/$new_g;
- }
- else {
- $flt_g[$j][$i] = 1;
- }
- $new_b = abs(($cpxl & 0xFF) - ($pxl & 0xFF));
- if ($new_b != 0) {
- $flt_b[$j][$i] = 1/$new_b;
- }
- else {
- $flt_b[$j][$i] = 1;
- }
- }
- $flt_r_sum += $flt_r[$j][$i];
- $flt_g_sum += $flt_g[$j][$i];
- $flt_b_sum += $flt_b[$j][$i];
- }
- }
- for ($j=0; $j<3; $j++) {
- for ($i=0; $i<3; $i++) {
- if ($flt_r_sum != 0) {
- $flt_r[$j][$i] /= $flt_r_sum;
- }
- if ($flt_g_sum != 0) {
- $flt_g[$j][$i] /= $flt_g_sum;
- }
- if ($flt_b_sum != 0) {
- $flt_b[$j][$i] /= $flt_b_sum;
- }
- }
- }
- $new_r = $new_g = $new_b = 0;
- for ($j=0; $j<3; $j++) {
- for ($i=0; $i<3; $i++) {
- $pxl = imagecolorat($source, $x-(3>>1)+$i, $y-(3>>1)+$j);
- $new_r += (($pxl >> 16) & 0xFF) * $flt_r[$j][$i];
- $new_g += (($pxl >> 8) & 0xFF) * $flt_g[$j][$i];
- $new_b += ($pxl & 0xFF) * $flt_b[$j][$i];
- }
- }
- $new_r = ($new_r > 255)? 255 : (($new_r < 0)? 0:$new_r);
- $new_g = ($new_g > 255)? 255 : (($new_g < 0)? 0:$new_g);
- $new_b = ($new_b > 255)? 255 : (($new_b < 0)? 0:$new_b);
- $new_pxl = imagecolorallocatealpha($source, (int)$new_r, (int)$new_g, (int)$new_b, $new_a);
- if ($new_pxl == false) {
- $new_pxl = imagecolorclosestalpha($source, (int)$new_r, (int)$new_g, (int)$new_b, $new_a);
- }
- imagesetpixel($source, $x, $y, $new_pxl);
- }
- }
- return true;
- break;
- case 9:
- return imageconvolution($source, array(array(-1, -1, -1), array(-1, 9, -1), array(-1, -1, -1)), 1, 0);
- break;
- case 10:
- return imageconvolution($source, array(array(1, 1, 1), array(1, $arg1, 1), array(1, 1, 1)), $arg1+8, 0);
- break;
- }
- }
- }
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