I just realize I mistakenly sent the below message directly to Johannes
instead of the user-list. Has there been any further development or can
anyone provide me with an update on this topic please?
John P Santos
Photographer // Owner
GREENBEEMEDIA.COM
---------- Forwarded message ----------
From: John P Santos <jpsan...@greenbeemedia.com>
Date: Tue, Feb 18, 2014 at 4:37 AM
Subject: Re: [Darktable-users] More Instructions on colour calibration &
ICC Profiles.
To: johannes hanika <hana...@gmail.com>
Hi johannes,
Thanks for getting back to us.
On Sat, Feb 15, 2014 at 1:12 PM, johannes hanika <hana...@gmail.com> wrote:
>
> > > Could you two upload a sample raw + JPEG somewhere so we can see the
>> > > difference?
>> >
>> > i'd also like to have this input.. i might be able to let my optimizer
>> > script search for darktable module parameters which will result in the
>> > desired look.
>>
>> Given a set of raw/jpgs could you generate dt styles which resemble the
>> camera's picture style?
>>
>
> not easily, i think this will take you as close as you can currently get
> (creating a fake-icc profile):
>
> https://encrypted.pcode.nl/files/temp/argyll/
>
> (apparently broken with newer argyll versions though)
>
So the script lut.sh is the one we want? I see it creates a table based on
the linear output of a
>
>
>> If so, shouldn't we try to come up with sets of raw/jpgs for each camera
>> model
>> and add such styles to dt. I feel like this would be a welcomed feature
>> for
>> people now to raw development,
>
>
> i'm very much unsure whether abusing the color management pipeline for
> canned styles is a good way to go. more like a short term workaround to
> reproduce proprietary styles.
>
How is this an abuse of the color management pipeline? Are there any
alternatives at the moment? The fact is the tonality and color rendition
that the cameras are producing give more attractive results than a
"standard color" input profile and the enhanced one is a compromise for
most cameras. For my 6d, there is no enhanced matrix, and LUT based ICC
profiles are broken so I can't accurately reproduce what the cameras based
on a calibration chart.
Would a better solution be another module that lets you recreate a "Picture
Style"?
>
>
>> but also as a starting point for more
>> experienced guys.
>>
>
> not sure about this in the context of fake-icc profiles. first off, you'd
> lose all color management, secondly it's not easy to edit a look up table
> profile.. you'll end up not doing it and just adding up more edits on top,
> starting from zero and a black magic box.
>
> converting a lut into useful settings for dt modules is unfortunately even
> more non-trivial to do. it seems possible though, and we have a couple of
> tools that go that direction (see basecurve fitting, the above script, and
> my branch which i highly discourage to try at this point, it will break
> history stacks) but that is still a lot of work.
>
> so at this point it's too early to collect raw/jpg pairs.
>
> -j.
>
What exactly do we need to pull something like this off? From the above
script I see it comparing a linear profile with a camera rendered image.
That'll create more or less what I was asking for before. The color
balance module I don't think would accurately create this effect.
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