Superimposing images in PHP

Question

Is there a PHP function that would allow me to superimpose an image over another one? If not, how can I accomplish this (not asking for code, just a list of steps)?

Answer 1

Use the GD graphics library. There is an example of creating a watermark, which is basically the same thing using the imagecopymerge() function.

Answer 2

Hi,

I suppose there are functions provided by GD (generally enabled on PHP installations) that might do just that.

For instance, maybe one of imagecopy or imagecopymerge functions, I'd say.

See Example #1 Merging two copies of the PHP.net logo with 75% transparency on the manual page of the second one (quoting) :

<?php
// Create image instances
$dest = imagecreatefromgif('php.gif');
$src = imagecreatefromgif('php.gif');

// Copy and merge
imagecopymerge($dest, $src, 10, 10, 0, 0, 100, 47, 75);

// Output and free from memory
header('Content-Type: image/gif');
imagegif($dest);

imagedestroy($dest);
imagedestroy($src);
?>

There are also these two examples that might prove useful :

• Adding watermarks to images using alpha channels
• and Using imagecopymerge() to create a translucent watermark