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
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/
G'MIC Reference: http://gmic.sourceforge.net/reference.shtml#watermark_fourier
Note : GMicQt is not yet available in BQM. It's only present in Image Editor. Gilles Caulier
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