| > It's easiest to explain what I'm seeing with a sample NEF and its
| > embedded preview:
| > http://www.cs.toronto.edu/~cks/tmp/darktable/DSC_4429.NEF
| > http://www.cs.toronto.edu/~cks/tmp/darktable/DSC_4429_preview4.jpg
|
| Your second link is broken, looks like it should be:
|
| http://www.cs.toronto.edu/~cks/tmp/darktable/DSC_4429-preview4.jpg
Oops, yes. My fault and thanks for letting me know. (I've added a
symlink so that it works now, or at least so that it should.)
| IIRC, it was stated that the temperature control on the white balance
| module is for convenience only, and the value is not related to any
| objective measure... of course, if it's maxing out, that's not very
| convenient. :)
My view is that getting it into the rigth ballpark is important for
both adjustability (a 100 kelvin change means more at lower K values)
and for understanding what's going on and general usability. For
example, the D7100 '5000K' white balance present currently comes out
with a DT K value of 8364K and the 'shade' preset to 17199K. And if the
values are arbitrary and way off, clamping them to 23000K is (as you
mentioned) not too useful.
(Part of the usability is for adopting processing suggestions written
for other RAW processors to Darktable. Right now, 'add 200K of white
balance' is not really useful or easily adoptable directions for at
least some cameras.)
In fact I would go so far as to say that if Darktable's Kelvin scale of
colour temperature is so arbitrary and so far off the scale should not
be called '(kelvin) colour temperature'. Call it 'white balance index'
and scale it differently using whatever units are convenient.
(Of course I would prefer if DT really had a Kelvin colour temperature
scale and it worked right. But clearly it doesn't right now, so the
easiest fix may be some redefinitions. This might also allow for it to
be in more convenient units for changes.)
- cks
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