I've made some more attempts at figuring out what my issue might be, but
I still haven't found a solution. I updated my system again in the hope
that the issue would be automagically fixed, but no luck. I also
installed darktable on my laptop, same issue there. I've looked at which
packages I've updated lately, but haven't found anything suspicious.
raw-identify from libraw 0.14.7 gives daylight multipliers 2.753 0.922
1.151, which when normalized is the same that darktable uses (tint
1.001, temp 6405K). raw-identify also gives camera multipliers 2684 1024
1504 1024 (tint 0.967, temp 5028K) for the photo I've uploaded, which
seems to be about the same as "dcraw_emu -w" uses (i.e. "correct" WB). I
should perhaps say that I'm using darktable-git at the moment, which
only uses one temperature slider.
I also looked a bit into the source code for darktable, and looked at
the reload_defaults functions for the temperature module. After the RAW
is loaded with libraw_open_file I noticed that raw->color.cam_mul is {0,
1, 0}, which leads darktable to use raw->color.pre_mul instead, which is
the same as the daylight multipliers that raw-identify reports (i.e.
6405K). I then tried to find where these numbers came from, but libraw
isn't exactly straight-forward to understand :)
Regards,
Per
On 2013-05-13 20:12, Per Östlund wrote:
> Hi!
>
> Darktable has suddenly decided that all my photos were taken with a
> white balance of 6504K, which makes photos taken in daylight appear
> yellow. RawTherapee also shares this delusion, so I suspect it's not
> actually darktable's fault but some library that darktable uses that's
> been updated recently. It's not a camera issue, since old photos are
> also affected.
>
> Setting the white balance manually works fine, so it appears as if
> darktable just can't read the white balance from the camera.
> "dcraw_emu -w" from libraw also gives the correct white balance. The
> same issue occurs with both darktable 1.2 and darktable from git. My
> camera is a Sony NEX-7, and the same issue occurs with older photos
> taken with a NEX-5. I put up a RAW on my google drive if anyone wants
> to take a look. The preview that google shows is a bit colder than
> "dcraw_emu -w" gives, but it's reasonably accurate. I also put up a
> downsized JPEG from darktable without any settings changed to show
> what darktable gives. The photo was taken with a manual lens, so the
> EXIF for aperture and such is wrong in case you wonder about that.
>
> RAW:
> https://docs.google.com/file/d/0B14SELFLwaQ1UTNkYVRQVXI2MzA/edit?usp=sharing
> JPEG:
> https://docs.google.com/file/d/0B14SELFLwaQ1ZzE3Z1MtX2p6VU0/edit?usp=sharing
>
> Anyone know what the issue might be?
>
> Best regards,
> Per Östlund
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