Thanks Torsten. I think I I think that the default NEX jpeg colors are
often just as bad as the base curve for fuchsia. My impression is that from
a user point of view the tone curve is not as fierce in its saturation
effect on auto mode and gives a more natural effect than the base curve.
Were I able to split the base curve into separate RGB curves similar to the
LAB GUI this might be more interesting, in example for cross-processing or
compensating shades for a CFL.
Or is this already in beta?
Best,
Gert
On Fri, Oct 11, 2013 at 1:06 PM, Torsten Bronger <
[email protected]> wrote:
> Hallöchen!
>
> Gert van der Plas - Schrama writes:
>
> > [...]
> >
> > 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.
>
> Mathematically, there is a significant difference whether you apply
> a gamma curve to RGB channels or Lab channels, no matter whether you
> do the latter with auto chromaticity or not. At the same time,
> there is no objective argument why the base curve should yield a
> more pleasing result than the tone curve.
>
> However, the base curve works similar as the chemicals in
> photographic film. They, too, have a non-linear gamma-like response
> curve. And they, too, yield gray if all three channels are the
> same. This way, the base curve tries to meet our photographic
> viewing habits.
>
> Tschö,
> Torsten.
>
> --
> Torsten Bronger Jabber ID: [email protected]
> or http://bronger-jmp.appspot.com
>
>
>
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