On 04/14/2013 12:19 PM, WanderingPen wrote: > I would like to add a hidden watermark to my photos, but not sure how to do > so. > I did find a tutorial of how to make the watermark in GIMP, but it was written > using an old version of GIMP. I have the current 2.8 version.
Transparent vs. Hidden is a potential question. We often see "transparent" watermarks on commercial clip art, typically a mosaic of copyright notices positioned to "ruin" the image while allowing the original to show through. This is easily done via a text or image layer with its transparency adjusted. To create a "really" hidden watermark with the GIMP, see this tutorial, and a plugin using the same method: http://www.gimpdome.com/gimp-general-use/hidden-watermarks-in-gimp/ http://registry.gimp.org/node/21024 Not sure about the plugin, but the tutorial should work on any recent version of the GIMP. I just tested it in GIMP 2.8 and it worked as advertised. The plus side: This kind of watermark is very hard to spot, and difficult to remove even if someone realizes that it is present. The minus side: Digging a hidden watermark back out of a marked image and reading it, requires a copy of both the original and the watermarked image, and involves doing operations to reveal the difference between the marked and unmarked versions. You may need to hire an expert witness if you need to introduce this kind of watermark into evidence in a Court proceeding, to do the watermark extraction and render an "opinion" that it is genuine. By the time all is said and done, maybe it would be better to e-mail a copy of the original to yourself via a webmail service. A printed copy of this message provides a 3rd party time stamp, for proof of priority of publication. For a large number of images, e-mailing MD5 or SHA checksums of your original files to yourself may be a more practicable method of getting a 3rd party time stamp. :o) Steve _______________________________________________ gimp-user-list mailing list [email protected] https://mail.gnome.org/mailman/listinfo/gimp-user-list
