I got my hands on a Leaf Credo 40 digital back a few weeks ago, and so
far it's mostly worked stunningly with Darktable. I have noticed,
however, that in some images, particularly those with bright skies in
the background, I'm getting a noticeable centerfold effect between the
left and right half of the sensor. Here's an example of a RAW file and
XMP file that produce the effect in both the build of Darktable I've
been using (2.3.0+455~g55904ce36) as well as the current release version
2.2.5: https://drive.google.com/open?id=1LfP5rGfFkBBPuolZ1NzivgnbhUNX0RI0
At first I assumed this was just an artifact of the sensor and I'd
simply have to avoid those situations, but I tried processing the same
RAW file in UFRaw and couldn't get the centerfold to appear, no matter
what contortions I put the image through. So I guess this is actually
an artifact of the RAW processing, presumably a difference between
RawSpeed and DCRaw.
Does anyone have an idea what might be responsible for the difference,
and if it's something that might be easily fixable in RawSpeed, or
alternatively if there's some way I can force DT to use dcraw as a
fallback for a given image instead of RawSpeed? Or maybe I'm just
missing something and it's my own image settings that are responsible
for the seam showing up.
I also wanted to test the latest trunk build of DT to see if this had
been fixed since then, but the latest version actually seems to be
missing support for the Credo 40 (trying to click through to darkroom
mode on one of my images got me the "Couldn't read white balance
information" message that you always get with unsupported cameras). If
I get a chance in the next couple days I'll try to use git bisect to
figure out which revision broke support for it.
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