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Feature #12145

Tool for repairing camera induced image artifacts

Added by Jesper Anderson over 1 year ago. Updated over 1 year ago.

Status:
Incomplete
Priority:
Low
Assignee:
-
Category:
Darkroom
Target version:
-
Start date:
04/19/2018
Due date:
% Done:

20%

Estimated time:
Affected Version:
2.4.2
System:
Ubuntu
bitness:
64-bit
hardware architecture:
amd64/x86

Description

There is an issue with some Sony cameras where the PDAF system on the sensor can cause image artifacts looking like lines across the image. It would be wonderful to have the capability to fix this integrated into darktable. Perhaps a new tool which allows application of these kinds of fixes? Or maybe the concept fits in an existing tool?

DPReview has a nice overview on the problem at:

https://www.dpreview.com/news/6974141509/sony-striping-heres-the-fix

The code to implement the fix is available from Henry Dietz at the following page:

http://aggregate.org/DIT/KARWY-SR/karwy/test/karwy.html

History

#1 Updated by Sam Smith over 1 year ago

Hi, could you provide some files that have this issue? Thanks

#2 Updated by Jesper Anderson over 1 year ago

This DPReview sample shows the problem clearly.

The girls hair on this photo:

https://www.dpreview.com/sample-galleries/6769434587/sony-a7-iii-sample-photos/5296972217

#3 Updated by Sam Smith over 1 year ago

Ah thanks, I didn't see the download link for the raw version.

#4 Updated by Roman Lebedev over 1 year ago

  • % Done changed from 0 to 20
  • Status changed from New to Incomplete

1. this is super specific to the raw format
2. thus it would have to go into rawspeed, as a new, rather specific decompressor
3. there is no way to expose the choice of which decompressor to use back from dt to the library
4. and as the current rs maintainer, i'm not too convinced this should be in the library in the first place.
this is a very obvious manufacturer's defect. ask them. maybe RMA.
5. => lua script, to use that modified dcraw? :)

#5 Updated by Jesper Anderson over 1 year ago

On 4, it is not a manufacturer's defect but an artifact created by the sensor construction. It happens because of the PDAF sensors embedded on the sensor surface.

This can appear on all Sony A9 and Sony A7III images, and has been shown to occur on A7RIII images as well.

#6 Updated by Roman Lebedev over 1 year ago

Jesper Anderson wrote:

On 4, it is not a manufacturer's defect but an artifact created by the sensor construction. It happens because of the PDAF sensors embedded on the sensor surface.

So it's a sensor design defect. Still sounds like a manufacturers fault.

This can appear on all Sony A9 and Sony A7III images, and has been shown to occur on A7RIII images as well.

#7 Updated by Jesper Anderson over 1 year ago

Could be it's a sensor design defect, or just what happens when you add in a high amount of PDAF sensors among the image gathering sensors, which these cameras are the first to do.

Either way, it's not going away, and it's on three camera models so far. Being able to correct for it in an easy manner would be a very good thing.

#8 Updated by Tobias Ellinghaus over 1 year ago

I was just pinged by an RT dev, apparently they have a better solution in their code:

https://github.com/Beep6581/RawTherapee/blob/dev/rtengine/pdaflinesfilter.cc

I didn't check it myself, just wanted to pass on the information for your consideration.

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