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Adding watermarks to images using alpha channels


Adding watermarks to images using alpha channels

Example #1 Adding watermarks to images using alpha channels

<?php
// Load the stamp and the photo to apply the watermark to
$stamp imagecreatefrompng('stamp.png');
$im imagecreatefromjpeg('photo.jpeg');

// Set the margins for the stamp and get the height/width of the stamp image
$marge_right 10;
$marge_bottom 10;
$sx imagesx($stamp);
$sy imagesy($stamp);

// Copy the stamp image onto our photo using the margin offsets and the photo 
// width to calculate positioning of the stamp. 
imagecopy($im$stampimagesx($im) - $sx $marge_rightimagesy($im) - $sy $marge_bottom00imagesx($stamp), imagesy($stamp));

// Output and free memory
header('Content-type: image/png');
imagepng($im);
imagedestroy($im);
?>
adding watermarks to images using alpha channels
This example is a common way to add watermarks and stamps to photos and copyrighted images. Note that the presence of an alpha channel in the stamp image as the text is anti-aliased. This is preserved during copying.



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