Hallöchen!

Pascal Obry writes:

> Le 13/08/2013 08:57, Torsten Bronger a écrit :
>
>> The results can be found here:
>> http://wilson.homeunix.com/basecurve/d800/
>
> Thanks a lot! I tried to run the script on my side but it ends up
> with a divide by 0 after eating lot of memory. I was wondering how
> much memory do you have to run this? On my side the 8gb of memory
> seemed not enough...

It uses approx. 16 GB.  But I think <<1GB is necessary.  I just
wanted to get it done and used Python, which is unsuitable for this
kind of work.

And the divisions by zero are triggered by RAW brightnesses that do
not occur in the picture.  It is fixed now.  A good image should
cover all brightness levels, though.

> I tried the base curve and it is quite different than the current
> nikon curves in dt. The result is very good and seems closer to
> native nikon (and what I used to see in Lr) camera. Great job!

It is somewhat fishy that the base curve is virtually 100% from 90%
RAW brightness onwards.  This way, highlights are mapped to solid
white.  But maybe the Nikon engineers really did it this way ...

> BTW, should I just commit this new curve into dt under the name
> "nikon D800"?

The list of presets for the base curve module would get too long
with this approach I suspect.

Tschö,
Torsten.

-- 
Torsten Bronger    Jabber ID: torsten.bron...@jabber.rwth-aachen.de
                                  or http://bronger-jmp.appspot.com


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