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-GmicAssignee: Digikam Developers <digikam-bugs-null>
Status: RESOLVED FIXED    
Severity: wishlist CC: aspotashev, bugs, caulier.gilles
Priority: NOR    
Version First Reported In: 4.2.0   
Target Milestone: ---   
Platform: Gentoo Packages   
OS: Linux   
Latest Commit: Version Fixed In: 8.4.0
Sentry Crash Report:

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
Comment 4 caulier.gilles 2024-05-26 05:47:48 UTC 
Hi DrSlony,

The new Batch Queue Manager tool for the G'MIC processor will be available in next digiKam 8.4.0.

With this tool you can apply in batch a G'MIC command over a set on images from your digiKam collection.

Watermark Fourier filter can be applied as expected :

From the Image Editor : https://i.imgur.com/4PRNGEY.png
From the Batch Queue Manager : https://i.imgur.com/4oeYSbi.png

Note that the G'MIC command string to host in the Batch Queue Manager can be copied from the IMage Editor tool using the "copy" button on the top if the dialog.

Best regards

Gilles Caulier