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PHP imagefilter without GD
This code is intended for imagefilter() to work on the servers which don't have PHP GD extension.
//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’,0);
#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;
}
}
}
?>
Topics: PHP | Submitter: admin
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