rgb192
asked on
replace white with transparent
using a png image
is there a way to go through an image and replace white (0xff)
with
another color
transparency color would be the best
is there a way to go through an image and replace white (0xff)
with
another color
transparency color would be the best
//load the image
$img = imagecreatefromjpeg("http://ecx.images-amazon.com/images/I/413XvF0yukL._SL500_AA280_.jpg");
//find the size of the borders
$b_top = 0;
$b_btm = 0;
$b_lft = 0;
$b_rt = 0;
//top
for(; $b_top < imagesy($img); ++$b_top) {
for($x = 0; $x < imagesx($img); ++$x) {
if(imagecolorat($img, $x, $b_top) != 0xFFFFFF) {
break 2; //out of the 'top' loop
}
}
}
//bottom
for(; $b_btm < imagesy($img); ++$b_btm) {
for($x = 0; $x < imagesx($img); ++$x) {
if(imagecolorat($img, $x, imagesy($img) - $b_btm-1) != 0xFFFFFF) {
break 2; //out of the 'bottom' loop
}
}
}
//left
for(; $b_lft < imagesx($img); ++$b_lft) {
for($y = 0; $y < imagesy($img); ++$y) {
if(imagecolorat($img, $b_lft, $y) != 0xFFFFFF) {
break 2; //out of the 'left' loop
}
}
}
//right
for(; $b_rt < imagesx($img); ++$b_rt) {
for($y = 0; $y < imagesy($img); ++$y) {
if(imagecolorat($img, imagesx($img) - $b_rt-1, $y) != 0xFFFFFF) {
break 2; //out of the 'right' loop
}
}
}
//copy the contents, excluding the border
$newimg = imagecreatetruecolor(
imagesx($img)-($b_lft+$b_rt), imagesy($img)-($b_top+$b_btm));
imagecopy($newimg, $img, 0, 0, $b_lft, $b_top, imagesx($newimg), imagesy($newimg));
//finally, output the image
header("Content-Type: image/jpeg");
imagejpeg($newimg);
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