Hi Johannes,
I did try the tool. Followed the baked in manual of basecurve. It gave a
very incorrect curve. Even with a nicely ranged RAW with over and
underexposures (which was not stated in the basecurve tool). Giving up for
now :-(.
Best,
Gert
On Sun, Oct 13, 2013 at 10:32 AM, johannes hanika <[email protected]> wrote:
>
>
>
> 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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>
>
>
> ------------------------------------------------------------------------------
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