Hi Torsten,
I am running 1.2.3. for the family pictures. If I understand you correctly
you mean the following for the base curve. The base curve increases both
intensity and saturation, from your comment by scaling the vector <r,g,b>.
The remark on tone curve is still a bit fuzzy for me. If on manual. I'd
guess that color saturation remains, only lightness changes. However for
auto tone curve does something similar for me as the base curve. Is the
difference of tone curve on auto a different scaling of <L,a,b> or <r,g,b>
such that it makes colors brighter in such way as the human eye would
expect them for more brightness.
If so what is the use for the base curve in RGB? Is it an alternative way
for exposure and blacklevel? I assume the Bayer patterned RGB response
curves of the sensors are already properly corrected in the RGB color
matrix conversion process.
Best,
Gert
On Fri, Oct 11, 2013 at 9:25 AM, Torsten Bronger <
[email protected]> wrote:
> Hallöchen!
>
> Gert van der Plas - Schrama writes:
>
> > Could someone tell me the exact difference between the base curve
> > and the tone curve.
>
> Technically, the base curve happens in RGB space, and the tone curve
> in Lab space. Among other things, this means that flat areas in the
> base curve tend to desaturate, which is not the case for the tone
> curve.
>
> > [...]
> > The default base curve for the nex is really ugly for most cases.
>
> The "Sony-like" base curve of Darktable is substantially darker than
> the in-camera NEX base curve. I you know a little bit of C, you can
> add a NEX curve to
>
> http://darktable.org/redmine/projects/darktable/repository/revisions/master/entry/src/iop/basecurve.c
> It is:
>
> {sony_nex, "SONY", "NEX", 0, 51200, {{{{0.000000,
> 0.000000},{0.000100, 0.000426},{0.001000, 0.000735},{0.007000,
> 0.022061},{0.010000, 0.040219},{0.030000, 0.124101},{0.100000,
> 0.379779},{0.130000, 0.472991},{0.160000, 0.541775},{0.200000,
> 0.605820},{0.250000, 0.671568},{0.300000, 0.731217},{0.400000,
> 0.808249},{0.500000, 0.864802},{0.600000, 0.896690},{0.700000,
> 0.925065},{0.800000, 0.951827},{0.900000, 0.976113},{0.950000,
> 0.990095},{1.000000, 1.000000}}}, {20}, {m}}, 1},
>
> You must also add the line
>
> static const char sony_nex[] = N_("sony NEX like");
>
> at the appropriate position in the same file.
>
> Tschö,
> Torsten.
>
> --
> Torsten Bronger Jabber ID: [email protected]
> or http://bronger-jmp.appspot.com
>
>
>
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