Non-Local Means noise reduction filter
This is just a suggestion for another (enhance) filter that might be useful :)
NL-means
https://en.wikipedia.org/wiki/Non-local_means
The current ffmpeg and handbrake implementation is by Dirk Farin
http://www.dirk-farin.net/projects/nlmeans/index.html
Bradley Sepos improved it while implementing it in Handbrake (I don't know whether they would be useful for GIMP, but I suggest you to take a look, because I suspect they are)
Discussion on ffmpeg trac:
https://trac.ffmpeg.org/ticket/4910
Handbrake forum:
https://forum.handbrake.fr/viewtopic.php?f=4&t=30135
A different implementation:
http://avisynth.nl/index.php/TNLMeans
An OpenCL Implementation:
https://forum.doom9.org/showthread.php?t=171379
What do you think? Is it useful?
Edited by Felix Baumann