Bug 338779

Summary: Add new tool to embed hidden watermarking (based on wavelets or Fourier transforms)
Product: [Applications] digikam Reporter: DrSlony <bugs>
Component: Plugin-Bqm-WaterMarkAssignee: Digikam Developers <digikam-bugs-null>
Status: REPORTED ---    
Severity: wishlist CC: aspotashev, bugs, caulier.gilles
Priority: NOR    
Version: 4.2.0   
Target Milestone: ---   
Platform: Gentoo Packages   
OS: Linux   
Latest Commit: Version Fixed In:

Description DrSlony 2014-09-03 13:51:41 UTC 
This is a feature request for a hidden watermark tool in the BQM, so that we can conceal a hidden plain-text or image watermark into our photos.

I am aware of a wavelet-based method and a fourier-based one.
http://www.cs.cornell.edu/topiwala/wavelets/report.html

You can do this using Mathmap or G'MIC, however those tools do not work in batch. It would be awesome if digiKam let us do this!

Reproducible: Always
Comment 1 DrSlony 2014-09-03 13:55:55 UTC 
G'MIC's "Fourier watermark" can be found in the "Spectral filters" menu:
https://gmicol.greyc.fr/
A discussion about it:
https://www.flickr.com/groups/gmic/discuss/72157624462331405/
Comment 2 DrSlony 2014-09-03 14:04:02 UTC 
G'MIC Reference: http://gmic.sourceforge.net/reference.shtml#watermark_fourier
Comment 3 caulier.gilles 2022-01-15 12:58:30 UTC 
Note : GMicQt is not yet available in BQM. It's only present in Image Editor.

Gilles Caulier