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Bug #10619

'difficult' lighting causes completely black file export

Added by Robin Rainton over 4 years ago. Updated over 4 years ago.

Status:
Incomplete
Priority:
Low
Assignee:
-
Category:
Darkroom
Target version:
-
Start date:
08/26/2015
Due date:
% Done:

20%

Estimated time:
Affected Version:
1.6.7
System:
Fedora/RHEL
bitness:
64-bit
hardware architecture:
amd64/x86

Description

I have some shots that were taken in a road tunnel in Norway. The lighting in here was very unusual. Everything was blue.

My camera (Nikon D7200) faithfully renders the lighting when looking at the images in camera. In camera RAW -> JPG conversion works fine.

Initially looking at these images in lighttable shows the thumbnails very similar to what is seen in camera.

However, trying to develop any of these causes horrible red/purple levels if one uses any of:

- tone curve
- levels
- contrast brightness saturation

... and probably more.

Moreover, trying to export at least one of these images (some do work) causes a fully black JPG (or TIFF, doesn't matter which format is chosen) to be written.

Please advise if I should attach RAW to this ticket for investigation. They are rather large (30-33MB).


Related issues

Is duplicate of darktable - Bug #9479: saturated blue are reproduced as black for Nikon nef files when identity transformations are appliedFixed06/23/2013

History

#1 Updated by Roman Lebedev over 4 years ago

  • Is duplicate of Bug #9479: saturated blue are reproduced as black for Nikon nef files when identity transformations are applied added

#2 Updated by Roman Lebedev over 4 years ago

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

Without a sample raw, my guess it is a duplicate of #9479
Solution: https://www.darktable.org/usermanual/ch03s04s03.html.php#d0e7524

#3 Updated by Robin Rainton over 4 years ago

Roman Lebedev wrote:

Without a sample raw, my guess it is a duplicate of #9479
Solution: https://www.darktable.org/usermanual/ch03s04s03.html.php#d0e7524

I don't think this is the same as #9479. The entire frame is black only when exported, there are no black areas when working in darktable.

That said, I closed the Darktable app and re-opened and tried to export the same image and it worked this time. Something fishy is certainly happening though.

The issue with red/purple areas is a problem for sure.

I include a RAW file here to demonstrate.

I can't upload the RAW here but you can download a sample here (interestingly Google Drive renders this very similarly to the camera):

https://drive.google.com/file/d/0B2A8JXgfNq1Ba1hvZGFNSy1kb00/view?usp=sharing

Also available in: Atom PDF

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