Thanks a lot indeed for this new, amazing filter!
I am wondering whether It may be possible to expand this filter in order to get a new opposite option?
In short, as with Gimp, with the foreground select tool, IMHO, it would be very useful to have this same option with G'mic with this new filter.
More precisely, with G'mic:
1. You might "paint" on the image you want to extract from the background;
2. When you are done, you might apply this filter in order to "delete" all background (all pixels should be deleted).
In essence, the filter should be able to delete all unnecessary pixels (the ones NOT selected) in order to extract your image from the background.
For example, in the picture where there is the bird (the image just posted by Ronounours) you might be able to extract the bird from the background (that is, the opposite of what the filter is doing right now....).
The Siox algorithm implemented in Gimp allows to get the same result.
Maybe this new filter with G'mic might be more powerful compared to Siox on top
In addition of requiring a minor amount of clicks to get the job done (namely extract your image from the background).
P.s: Some years ago (2009) there has been a Google - Summer of Code which was aimed to improve the Siox algorithm version on Gimp.
Unfortunately, this Gsoc work was never merged to Gimp
To my knowlege, the Siox algorithm version implemented on Gimp has not received any improvement these past years...
Two years ago the Krita team tried to implement the Siox algorithm on Krita, through a Google Summer of Code project, but this student failed as well