Hi Jason,
I agree with your observations. I often use more than one denoise
option. I now really like the denoise profiled chrominance only option.
give it a try if you haven't already.
I have put together this general observation for my students about these
two now renamed denoise options. I just really struggle with the name
'surface blur' over denoise bilateral filter. Not trying to hassle the
developers online here. Just offering some hopefully constructive feedback
about renaming modules in the future.
1. Denoise bilateral filter (correction group)
The denoise bilateral filter is used to denoise high ISO images while
claiming to preserve sharp edges. It uses a lot of computer resources
including RAM and CPU. This looks like a promising denoise tool as the
edges remain sharp-looking with effective noise removal. Exceptionally good
in large areas with little detail. In Darktable version 3.2.1 this module
was not working correctly on my Windows computer despite working well with
earlier versions.
2. Denoise non-local means (correction group)
Denoise non-local means has separate sliders for luma and chroma (colour)
noise. Reduces noise but preserves structures by averaging pixels with
neighbouring pixels.
· Set luma slider to the lowest effect value as image is softened and
details lost
· Chroma slider can often be set high or even 100% with no problems
On Mon, 11 Jan 2021 at 05:28, Jason Polak <[email protected]> wrote:
> Just a quick comment on this: the astrophoto denoise (formerly non-local
> means) is a very effective way to get rid of just colour noise with very
> little to no loss in image quality, and is certainly not restricted only
> to astrophotography. I still use it in conjunction with profiled denoise
> to get the best results.
>
> Jason
>
> >
> > On Tue, 5 Jan 2021, 23:45 Terry Pinfold, <[email protected]
> >
> > Renamed Modules
> >
> > The following modules have been renamed to better describe their
> > use. These modules can still be found using their old names in the
> > module search box.
> >
> > denoise (non-local means) is now astrophoto denoise
> > denoise (bilateral filter) is now surface blur
>
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>
--
Dr Terry Pinfold
Cytometry & Histology Lab Manager
Lecturer in Flow Cytometry
University of Tasmania
17 Liverpool St, Hobart, 7000
Ph 6226 4846 or 0408 699053
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