Colour space (commonly SRGB or Adobe RGB). This essentially defines the
‘universe’ of available colours, changing this should have no visible effect
on how colours are rendered unless you are talking about extremely saturated
marginal colours that can’t be represented in all colour spaces - however If
you have an image in one colour space e.g. Adobe don’t expect it to look quite
right if your software thinks it is in something different such as SRGB .
Adobe RBG and SRGB are fairly similar so a mismatch isn’t too bad and results
just in some fairly subtle rendering differences but if you have a mismatch
between two exotic and very different colour spaces then expect psychedelics.
Input profile – corrects for non-linearities in your camera or other source and
is generally not needed
Output profile – corrects for non-linearities in your display,
printer/ink/paper combination, or other output device and is generally essential
Rgds,
Rob.
From: Petr Vorel [mailto:[email protected]]
Sent: 12 November 2014 11:32
To: darktable-users
Subject: Re: [Darktable-users] Color management, LUT and swapped matrix
The input color profile has such a strong effect because it basically changes
how the colors are represented, interpreted, it's the option you should use to
correct for color disbalancies from your camera. I haven't found yet any use
for output profile. It sets how the colors are displayed - I choose either sRGB
or very rarely Adobe RBG if I like the look.
On 12 November 2014 12:22, Petr Vorel
<[email protected]<mailto:[email protected]>> wrote:
I believe that raw has no color profile set so it is up to the software to
apply one.
The settings of color profile in-camera apply only to jpegs.
Also I wouldn't use cLUT with darktable. The colors are off as the profile is
not applied correctly. You can try to compare with Photoshop applied profile,
or Digikam if you happen to be using Linux.
On 12 November 2014 08:47, ternaryd
<[email protected]<mailto:[email protected]>> wrote:
On Tue, 11 Nov 2014 11:08:02 +0100
"Michael Below" <[email protected]<mailto:[email protected]>> wrote:
> AFAIK Argyll and LittleCMS are different parts of
> the color management system, not competitors.
> Try enabling LittleCMS.
I wonder, what each might be responsible for.
In the meanwhile, I don't have a profile with
swapped matrix anymore. Nevertheless I did this but
couldn't notice any visual difference. Then, I saw,
that among the modules the input/output profiles,
and those definitively did make a difference,
although I'm not yet sure if to better.
My camera allows me to select one of two color
spaces: sRGB and Adobe RGB. The current setting can
be found also in Exif.Photo.ColorSpace. First I was
wondering, why darktable doesn't use this
information. But then I thought, as the images from
the camera are raw+jpeg, darktable would use raw,
and for that, the color space can be changed out of
camera. Is this correct? Why would an input profile
then make such a strongly visible difference
keeping the output color space the same?
Thanks,
--
Cris
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