Composite with tile (watermark)

[Pacio]

Hey,

I'm trying to do a simple watermarking script, so I can secure images on my site from stealing.
Here is a site with the effect I would like to achieve: http://www.selonen.org/arto/netbsd/watermarks.html
He's using:

Code: Select all

composite -dissolve 15 -tile watermark.png src.jpg dst.jpg

How can I get the same result with PHP?

I created a PNG transparent image on my own, but can't tile it on the original image.

Thanks in advance

Regards
Pacio


*EDIT*
How I solved it:

Code: Select all

$main = new Imagick('src.jpg');
$watermark = new Imagick('watermark.png');

$watermark_width = $watermark->getImageWidth();
$watermark_height = $watermark->getImageHeight();

$rows = ceil($main->getImageWidth() / $watermark_width);
$cols = ceil($main->getImageHeight() / $watermark_height);

for ( $w=0; $w <= $rows; $w++ ) {
	for ( $h=0; $h <= $cols; $h++ ) {
		$main->compositeImage($watermark, imagick::COMPOSITE_DEFAULT, $w*$watermark_width, $h*$watermark_height);
	}
}

$main->writeImage('dst.jpg');

I had to change PNG layer opacity to about 30%.