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Bug #12313

CR2 import noise issues

Added by Gabe Krause 5 months ago. Updated 4 months ago.

Status:
Closed: invalid
Priority:
Low
Assignee:
-
Category:
General
Target version:
Start date:
09/04/2018
Due date:
% Done:

0%

Affected Version:
2.4.4
System:
Windows
bitness:
64-bit
hardware architecture:
amd64/x86

Description

I'm experiencing a very ugly noise problem when importing CR2 generated from a Canon Powershot S90. That camera is long gone and I'm just processing some old files, but nonetheless, it seems like a bug worth reporting.

Attached are jpeg that quickly show the difference between darktable's default output vs. any other RAW viewer. Also attached are the RAW files (CR2 and subsequent DNG) for analysis, if needed.

noise via CameraRaw.jpg - jpeg export of the DNG (default settings) from Camera Raw showing expected noise. (5.74 MB) Gabe Krause, 09/04/2018 09:23 PM

noise via darktable.jpg - jpeg export of the DNG from darktable showing excessive noise. (24.7 MB) Gabe Krause, 09/04/2018 09:24 PM

noise.CR2 - Original CR2 file. (14.7 MB) Gabe Krause, 09/04/2018 09:24 PM

noise.CR2.dng - DNG file generated by Camera Raw from original CR2. RAW only (no jpeg was embedded). (11.9 MB) Gabe Krause, 09/04/2018 09:24 PM

History

#1 Updated by Gabe Krause 5 months ago

Also, the converted noise.CR2.dng file doesn't render in darktable (skull icon) reporting some "failed to read white balance" issue.

#2 Updated by Roman Lebedev 5 months ago

Gabe Krause wrote:

I'm experiencing a very ugly noise problem when importing CR2 generated from a Canon Powershot S90. That camera is long gone and I'm just processing some old files, but nonetheless, it seems like a bug worth reporting.

Attached are jpeg that quickly show the difference between darktable's default output vs. any other RAW viewer. Also attached are the RAW files (CR2 and subsequent DNG) for analysis, if needed.

As i've written in https://redmine.darktable.org/issues/12190, i think this is simply explained by the fact that darktable does not do any noise reduction by default.

#3 Updated by Gabe Krause 4 months ago

Thanks for your reply

Not really. darktable does not apply any noise reduction by default, unlike other software.
So i think the CR2 is imported properly.

Here's the related CR2 noise report (and white balance failure example)
https://redmine.darktable.org/issues/12313

Firstly, it helped as a sanity check. Then it's great to learn that darktable doesn't do any default noise reduction and that other's do.

I'm inspired to learn how do do my own noise reduction and would like to start by figuring out how to match the noise reduction from Camera Raw. The default settings there work quite well. Unfortunately for me, no matter how I tweak any denoise tool in darktable, I can't get anything close to the quality of the Camera Raw defaults.

Can you or anyone recommend tutorials, or guidelines beyond the darktable manual for me to refine this skill?

If it helps in your recommendation Camera Raw offers Luminance and Color sliders. Is there any corollary in darktable? I don't see anything of the like within the three darktable denoise modules

CR Default:

CR Denoise turned off:

darktable Default

Thank you!

#4 Updated by Roman Lebedev 4 months ago

  • Status changed from New to Closed: invalid

Gabe Krause wrote:

...

I'd try the usual dual-instance denoise (profiled) approach.
https://www.darktable.org/usermanual/en/correction_group.html#denoise_profiled

#5 Updated by Roman Lebedev 4 months ago

  • Target version set to 2.6.0

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