General Support: Watermarking

I have done searches and all I can find is how to add a watermark to a thumbnail.

I want to add a watermark to the full size image...how can I do this?

Thanks

First, look at mod_rewrite. It's a method to transparently turn foo.com/bar/bla into foo.com/bar.php?page=bla while the user always sees foo.com/bar/bla. This is how Plogger makes cruft-free URLs.

Second, look at the phpThumb docs, and how the watermarking code (mentioned above) works. Study the phpThumb method of watermarking images with GET variables.

Third, create a mod_rewrite rule that forces any request to /images to pass the file through the watermarking code first. When it arrives in the user's browser, it will (a) be watermarked, and (b) it does not replace the original image. Why is that important? Well, if you put a massive "WakaWaka!!" through the middle of the original image, it will appear in all of your thumbnails... by the time it's made into a small thumbnail, it may be so distorted you cannot see the original image in the thumb. This way, you can watermark your large and small thumbs separately ... maybe just putting a "W!!" in the corner or not watermarking the small thumbs at all (who's stealing 100x100 images these days?).

Anyhow, that is how I would implement it, and should take very little PHP if any to get it set up. It's a matter of configuring your server and passing phpThumb the right variables, as well as putting your watermark (hopefully a nice alpha-transparent png) in the right spot.

Regards,
Derek