Hola Francisco,
I can see, clearly, a brown cast in the first example, not in the second
one.
Carlos
Tested in
Linux Mint 17.2 KDE
Monitor DELL U2413/HDMI
Firefox 42.0
El 23/11/15 a las 17:02, Francisco Cribari escribió:
Dear Kofa,
I proceeded as you suggested in Gimp and the gradient does *not* look
brownish on my monitor. I always calibrate my monitors using dispcalGUI +
ColorHug. I've printed a fairly large number of black and white of photos
(here in Brazil and also at Blurb) and noticed a slight brownish (warm)
tint on them (at least, on most of them). That's why I use the minor
correction I described in the video which is made using Darktable's color
correction module. (It does not work when the BW conversion is done using
channel mixer since channel mixer comes after color correction in the
pipeline. I then use the monochrome module for BW conversion.) Having said
that, the problem might as well be on my end.
I have just exported the same photo without and with the correction. Could
you please take a look at them and let me know how they look on your
monitor?
no correction:
https://dl.dropboxusercontent.com/u/2171814/photo-not-corrected.jpg
correction: https://dl.dropboxusercontent.com/u/2171814/photo-corrected.jpg
It would be useful if other people could do the same and let me know how
they see the two photos on their monitors.
Thanks for your feedback. Francisco
On Mon, Nov 23, 2015 at 4:32 PM, KOVÁCS István <k...@kovacs-telekes.org>
wrote:
Dear Francesco,
Thanks for letting us peek into your process; I like your images a
lot, and it was interesting to see what you do in the darkroom (of
course getting an interesting composition is the basis for everything
you do).
One thing that caught my attention was you mentioning a brownish cast
that you had to correct in the Colour correction module. I seem to
recall you mentioning this previously on Google+; I think there the
consensus was that likely your display profile is wrong - R=G=B should
give a neutral grey. Could you check this by launching Gimp, loading
your display profile (Edit/Preferences/Color Management/Monitor
profile), then create a gradient from black to white. If it looks
brownish, your profile is definitely broken.
OTOH, if you simply prefer a slightly cooler, blueish hue, it's simply
personal preference.
Thanks again,
Kofa
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Carlos Arigós
https://www.flickr.com/photos/chesterhimes/sets
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