Transparent PNG's

Hey,

I came across the same issue, went through all the threads I could find but I finally managed after a few research of my own to find the solution to the transparent PNG backgrounds that go black.

Here is how:

Open the ‘image-watermark.php’ file from the plugin folder and go to line 1275 (version 1.3.3 of the plugin), or find the function named ‘private function get_image_resource($filepath, $mime_type)’

Then, just add this : imagesavealpha($res, true);
After the line : $res = imagecreatefrompng($filepath);

I also noticed something weird at the line right after, which was like this:
$transparent = imagecolorallocatealpha($res, 255, 255, 254, 127);

I thought the third ‘254’ should be ‘255’ to match the transparency, so I just changed that line too to this:
$transparent = imagecolorallocatealpha($res, 255, 255, 255, 127);

After these 2 changes, the function should look like this:

private function get_image_resource($filepath, $mime_type)
	{
		switch($mime_type)
		{
			case 'image/jpeg':
			case 'image/pjpeg':
				return imagecreatefromjpeg($filepath);

			case 'image/png':
				$res = imagecreatefrompng($filepath);
                                imagesavealpha($res, true);
				$transparent = imagecolorallocatealpha($res, 255, 255, 255, 127);
				imagefilledrectangle($res, 0, 0, imagesx($res), imagesy($res), $transparent);
				return $res;

			default:
				return FALSE;
		}
	}

Hope this helps! it was such a shame that this beautiful plugin was missing that.
Maybe the author should consider updating so this doesn’t happen anymore ??

Thanks again for the amazing plugin!