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Bug #11647

Mystery artifact in RW2 file

Added by Richard Wonka almost 3 years ago. Updated almost 3 years ago.

Status:
New
Priority:
Low
Assignee:
-
Category:
Darkroom
Target version:
-
Start date:
06/10/2017
Due date:
% Done:

0%

Estimated time:
Affected Version:
2.2.5
System:
Ubuntu
bitness:
64-bit
hardware architecture:
amd64/x86

Description

Hello there,

I just exported an RW2 file as a jpeg for printing and upon a double-check spotted a mystery 5-pixel plus-shaped artifact in the output.

Upon investigation, this artifact shows up even at the bottom of the history stack, but I cannot find it when importing the file into aperture or rawtherapee.
The artifact is also present in an older rendering of the image here: https://www.flickr.com/photos/richardwonka/10385185383/in/album-72157636761236435/ - so this does not appear to be a regression.

I have not seen the artefact or anything like it on other images taken with this camera.

As it is, it appears that darktable introduces this into the image. It might just be some hot pixels, but if it is, I'm wondering why they show up only in darktable and not in other raw developers.

Any ideas?

P.S.: Maximum attachment size in issues is set to just under 50mb, so I'm guessing raw attachments are OK. - If they're not, I'll be happy to donate web space from my hosting plan to the project. (Seeing the slow upload to this redmine instance, I put the raw file into mega.nz, to just put the download link in here, but I can't cancel the upload to redmine now...)

darktable Screenshot from 2017-06-10 18.50.52.png (200 KB) darktable Screenshot from 2017-06-10 18.50.52.png mystery plus in purple shows up even at the bottom of the history stack Richard Wonka, 06/10/2017 03:04 PM
2013-03-20_KL_P1090571.RW2 (16.3 MB) 2013-03-20_KL_P1090571.RW2 Panasonic GX1 RW2 file with mystery artefact Richard Wonka, 06/10/2017 03:34 PM

History

#1 Updated by Roman Lebedev almost 3 years ago

If you visually compare the position of that artifact with the positions of the focus pixels, is there any match?

#3 Updated by Richard Wonka almost 3 years ago

Roman Lebedev wrote:

If you visually compare the position of that artifact with the positions of the focus pixels, is there any match?

hmm... not sure what you mean, there. I usually use center focus and recompose.

As for dedicated focus pixels, I don't think they exist in this relatively old µ4/3 camera.

#4 Updated by Roman Lebedev almost 3 years ago

Richard Wonka wrote:

Here is the RW2 file, just in case: https://mega.nz/#!Bgh2ACBQ!q50JQlmUCmP3ksVnvwzSam0IxomtTu5fbKxYYY3Osm0

Please do note that on https://raw.pixls.us we still miss an appropriate sample for that camera

#5 Updated by Richard Wonka almost 3 years ago

Oh, good to know. I'll put one up there.

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