On Fri, Oct 11, 2013 at 8:25 PM, 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.
>
>
there is also a small tool in tools/basecurve/ (
https://github.com/darktable-org/darktable/tree/master/tools/basecurve)
which allows you to measure and inject that basecurve into a running system
(without recompile). i'll have to write a blog post with instructions about
this one day.
-j.
> Tschö,
> Torsten.
>
> --
> Torsten Bronger Jabber ID: [email protected]
> or http://bronger-jmp.appspot.com
>
>
>
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