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Problems with watermark, the background becomes black instead of transparent. What could be wrong?
I have a problem - I make images for the site with a transparent PNG background and using PHP I put watermark on the images with a transparent PNG background too, and such a misfortune occurs - the watermark is superimposed on the image, but the background becomes black, and not transparent as it should be. What could be wrong?
Here is the PHP code:
<?php
waterMark($_SERVER['DOCUMENT_ROOT'].$_SERVER['REQUEST_URI'], "watermark.png", "bottom=5,right=5");
function waterMark($original, $watermark, $placement = 'bottom=5,right=5', $destination = null) {
$original = urldecode($original);
$info_o = @getImageSize($original);
if (!$info_o)
return false;
$info_w = @getImageSize($watermark);
if (!$info_w)
return false;
list ($vertical, $horizontal) = split(',', $placement,2);
list($vertical, $sy) = split('=', trim($vertical),2);
list($horizontal, $sx) = split('=', trim($horizontal),2);
switch (trim($vertical)) {
case 'bottom':
$y = $info_o[1] - $info_w[1] - (int)$sy;
break;
case 'middle':
$y = ceil($info_o[1]/2) - ceil($info_w[1]/2) + (int)$sy;
break;
default:
$y = (int)$sy;
break;
}
switch (trim($horizontal)) {
case 'right':
$x = $info_o[0] - $info_w[0] - (int)$sx;
break;
case 'center':
$x = ceil($info_o[0]/2) - ceil($info_w[0]/2) + (int)$sx;
break;
default:
$x = (int)$sx;
break;
}
header("Content-Type: ".$info_o['mime']);
$original = @imageCreateFromString(file_get_contents($original));
$watermark = @imageCreateFromString(file_get_contents($watermark));
$out = imageCreateTrueColor($info_o[0],$info_o[1]);
imageCopy($out, $original, 0, 0, 0, 0, $info_o[0], $info_o[1]);
if( ($info_o[0] > 250) && ($info_o[1] > 250) )
{
imageCopy($out, $watermark, $x, $y, 0, 0, $info_w[0], $info_w[1]);
}
switch ($info_o[2]) {
case 1:
imageGIF($out);
break;
case 2:
imageJPEG($out);
break;
case 3:
imagePNG($out);
break;
}
imageDestroy($out);
imageDestroy($original);
imageDestroy($watermark);
return true;
}
?>
DirectoryIndex index.php
<FilesMatch "\.(gif|jpg|png|PNG|GIF|JPG)$">
RewriteEngine On
RewriteCond %{REQUEST_FILENAME} -f
RewriteRule ^(.*)$ /wm/_wm.php [T=application/x-httpd-php,L,QSA]
</FilesMatch>
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Processing without alpha channel...
Add under
$out = imageCreateTrueColor($info_o[0],$info_o[1]);
the code:imagesavealpha( $out, true );
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