The problem is that your DNGs are the result of a conversion.
These DNGs are not officially supported.
From a recent discussion:
Tobias Ellinghaus schrieb am 04.04.2018 um 13:36:
Am Mittwoch, 4. April 2018, 13:15:39 CEST schrieb Timur Irikovich
Davletshin:
Hello everybody!
Just decided to play with DNG converter and discovered problem related
to lens data interpretation by DT (2.4.2).
1. NEF file loaded by DT applies correct lens parameters.
Lens info shown by DT: Nikon AF-S DX Nikkor 18-55mm f/3.5-5.6G
VR II
2. DNG file cannot apply it because wrong EXIF information is used
(short lens name vs. full).
Lens info shown by DT: 18.0-55.0 mm f/3.5-5.6
3. Focus information also is lost in DNG.
That's why we tell everyone to never convert to DNG.
Tobias
[...]
That's the short answer.
The long answer could look like this:
- DNG is a RAW file format like NEF or CR2 or ORF or ...
- this is true only if the file comes out-of-camera this way.
The devs try to support as many RAW formats as they can - if
user-provided samples are available.
Many of the proprietary RAW-Formats come with different flavours based
on Camera Model, Camera Settings etc.
So testing this is a tremendous effort which has to be done on every
(minor) release of darktable.
Adding a simple RAW=>DNG converter would double this effort.
But: adding more RAW=>DNG converters would multiply this effort since
every proprietary flavour of any proprietary format would have to be
tested against every (proprietary or not) RAW=>DNG Converter.
So I totally understand the devs to care about original RAWs and not
on any variant of those.
[Perhaps a prominent message about this would be a good thing in the
manual/list of supported cameras?]
Please use the original RAW files of your camera.
Looking at this table
https://www.darktable.org/resources/camera-support/ it seems your camera
isn't supported at all.
You could upload samples to https://raw.pixls.us/ to help support this
camera in future.
--
regards
Bernhard
https://www.bilddateien.de
Bruce Williams schrieb am 14.11.18 um 21:02:
Gah! My bad!
I meant to say in darkroom view, not "in light table view". My apologies.
Cheers,
Bruce Williams.
---------- Forwarded message ---------
From: *Φώτης Ζάγορας* <[email protected] <mailto:[email protected]>>
Date: Thu., 15 Nov. 2018, 06:48
Subject: Re: Fwd: [darktable-user] Problem with DNG files
To: Bruce Williams <[email protected] <mailto:[email protected]>>
Bruce,
by the way, I can see the history stack of changes only when I'm in
darkroom, not
in lighttable. Except this, when in darkroom, the small preview at the
bottom of the
screen of the pic I currently develop, it seems to be OK, in most of
the cases, but not always.
Thans, Fotis Zagoras.
Στις 14/11/18 9:18 μ.μ., ο Bruce Williams έγραψε:
Accidentally hit reply, instead of reply all.
Just forwarding this to the list.
Cheers,
Bruce Williams.
---------- Forwarded message ---------
From: *Bruce Williams* <[email protected] <mailto:[email protected]>>
Date: Thu., 15 Nov. 2018, 06:18
Subject: Re: [darktable-user] Problem with DNG files
To: Φώτης Ζάγορας <[email protected] <mailto:[email protected]>>
Fotis,
Take any image which is not displaying properly in darktable, and in
the light table view, click on the history module (left hand side of
the interface), and click on the bottom-most entry (0-original).
Did the image display correctly?
Cheers,
Bruce Williams.
On Thu., 15 Nov. 2018, 05:55 Φώτης Ζάγορας <[email protected]
<mailto:[email protected]> wrote:
Hi! Recently I have installed Darktable version 2.4.4 migrating from
lightroom.
In my photos collection I have a ton of DNG files converted to this
format from
the native KDC format of a KODAK P850.
Unfortunatrly I have seen that, when I activate darkroom, the
preview of
most
images of this format in main window of the application comes
with large
white (empty) spots - missing pixels. In other
photos I get the message that the white balance table cannot be read.
Obviously there is some serious problem with the sampling of DNG
photos in
the darktable application. With other applications i.e RawTherapy I
don't have
any problem. They read easily the same pics.
Can you propose me any solution....
Thanks,
Fotis D. Zagoras
Athens, Greece.
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