Playing with G'MIC, I came across a most awesome filter! When it works, it's incredible! Sadly, on my machine, it crashes/malfunctions more than it succeeds. It's the Fourier Watermark filter. I am ecstatic when it works, and I am hoping a developer sees this. I will try to contact them with my concern.
This first image, is the result of running the filter on a smaller sized version of my original image. A larger file size crashes the plugin. If the entered text is too long, the red, green and/or blue channels disappear! Here I reduced it enough and shortened my text enough to do this demo.
Go to Filters>G'MIC>Spectral Handling>Fourier watermark and put in your secret text. This was my result. Looks exactly like the original.
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WM_Test.jpg [ 345.27 KiB | Viewed 3912 times ]
After saving the image, I opened it in Gimp and ran the "Fourier Analsis" filter in G"MIC and got this next image. Like I said, I love the filter. They need to fix memory holes to get it right! I soooo need this filter!!