Bug 308141

Summary: NR needs some updates and improvements
Product: [Applications] digikam Reporter: 白川間瀬流 <vamp898-kde>
Component: Plugin-Editor-GmicQtAssignee: Digikam Developers <digikam-bugs-null>
Status: RESOLVED FIXED    
Severity: wishlist CC: caulier.gilles
Priority: NOR    
Version First Reported In: 3.1.0   
Target Milestone: ---   
Platform: Arch Linux   
OS: Linux   
Latest Commit: Version Fixed In: 8.4.0
Sentry Crash Report:

Description 白川間瀬流 2012-10-09 18:25:27 UTC 
If you checkout RawTherapee from HG it have some new Options for NR which blow digiKam away just like that.

Here are two example screenshots how the finished images look like

Its a ISO 25'600 shot from the 5D Mark III

Lot of detail (more noise): http://img6.imagebanana.com/img/eri1dtu9/screen.jpg
Less Noise (less details): http://img6.imagebanana.com/img/nx1pzkp6/screen1.jpg

The results are far away from what you get in digiKam (in a negative way).

With the new "Luminance Detail" switch you can just push Luminence Noise Reduction to 100 and then increase Luminence detail to the amount of detail you want.

The best balance of details and NR i ever seen so far, just incrdible.

When watching the screenshots, remember again that those are ISO 25'600 and look at the neck of the Head on the Left.

Try to get those details with digiKam without a lot of grain and mysterious artifacts.

So i recommend to look at there Source (its FLOSS) and check how they done it + adopt it.

If digiKam would have the same NR like RawTherapee, it would be able to be my ultimative tool for everything, right now i have to open High-ISO Shots RawTherapee always :(

Reproducible: Always
Comment 1 caulier.gilles 2012-10-09 19:13:43 UTC 
Can you share on the web your noise image to test ?

Gilles Caulier
Comment 2 白川間瀬流 2012-10-10 08:56:49 UTC 
Here is the Test-Image i used

http://movies.dpreview.com.s3.amazonaws.com/canon_eos5dmkiii/5D3_5224.CR2.zip

This is what the In-Camera NR does to the image

http://www.dpreview.com/reviews_data/canon_eos5dmkiii/boxshot/5d3_5224.jpg

The Camera NR is better than the one of digiKam but RawTherapee still owns both
Comment 3 白川間瀬流 2013-05-12 08:59:52 UTC 
New stable version of RawTherapee came out, improved even more...
Comment 4 caulier.gilles 2024-05-22 07:09:11 UTC 
digiKam Image Editor integrate the powerful GMicQt tool which propose a lot of filters to repair photo, including NR based on AI engine.

https://i.imgur.com/9UAggJf.png

All improvement must be based on GMicQt in the future. Integration of Gmic processor in digiKam BQM is under progress.

Gilles Caulier