I understand the limitations of the RGB tone curve. My question is: can it
be added to Darktable so that users would have the choice between a Lab and
an RGB tonecurve? Why would someone would want to use an RGB tone curve?
1) To adapt Lightroom (LR) presets to DT.
2) Users coming to DT from LR would feel more at home and would probably
make use of the RGB tone curve until they mastered the Lab tone curve.
3) I recently did a job together with a photographer who used LR. We wanted
the final images to have approximately the same look and feel. Our greatest
difficulty was with the tone curve. He did some tome curve adjustments in
LR that were not easy to reproduce in DT (at least for someone like me)
even using other DT modules. It would be nice to be able to use an RGB tone
curve in a situation like that.
Best, F.
Message: 1
Date: Thu, 22 Jan 2015 19:13:19 -0800
From: David Vincent-Jones <david...@gmail.com>
Subject: Re: [Darktable-users] RGB tone curve
To: darktable-users@lists.sourceforge.net
Message-ID: <7485955.nh8tzhs...@w530.site>
Content-Type: text/plain; charset="us-ascii"
On Thursday, January 22, 2015 23:19 Ariel Kanterewicz wrote:
> Reading through the thread, it looks like the general idea is that RGB
> curves are pointless or redundant... but if there isn't an equivalent way
> of manipulating the image, it's just another (fairly standard) tool, a
> different way of manipulatin the image, that we don't have in DT. *IF*
> there isn't an equivalent tool I don't see why we can't have them; I hide
> many modules on my DT installation, one more wouldn't be much of a bother.
Ariel;
I use the tone curves extensively, particularly with my B&W images. Where
there is a color image involved I am now switching to the 'manual' mode
which
appears to avoid some nasty color shifts. I use this function, one way or
another, with 99% of my images. 'Med-contrast' is built into most of my base
styles.
To date I have not been confident enough to work with the manual a and b
curves
... I play with them and then find another way to exact the change that I am
looking for. That is the nice thing about dt ... always lots of ways to skin
the cat.
Manipulating the tone curves is still (for me) not optimal. I find that
making
complex curves is rather like pushing a piece of string .. fragile to put it
mildly. Rawstudio was for me a winner in that department in that it allowed
me
to do some really fine (and complex) adjustment .. easily!
David
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