2013/8/13 Torsten Bronger <bron...@physik.rwth-aachen.de>
> Hallöchen!
>
> bartokk writes:
>
> > 2013/8/4 Torsten Bronger <
> bronger-vbodrt1yutdtpoovwizczbs11bumm...@public.gmane.org>
> >
> >> At <http://wilson.homeunix.com/basecurve/>, I summarise my
> >> results trying to get the base curve of my camera's JPEG engine.
> >> It worked pretty well I would say. Granted, I could not model
> >> the behaviour at *very* low values very well. This may be
> >> improved by using 16-bit TIFFs. Unfortunately, the Python
> >> imaging library can only deal with 8-bit files. Besides, I set
> >> the measured basecurve in DT by hand, which is inherently
> >> inaccurate.
> >
> > I Torsten,
> > from here:
> >
> > http://ubuntuone.com/310eCANWmS36wm4dGrCeA5
> >
> > you can download two couple of RAW+JPG from my Canon Eos Kiss X2 (450D).
>
> Thank you for your upload. Its basecurve is not very far away from
> "canon eos like", however, the shadows are slightly too bright with
> DT's curve. The basecurve can be reproduced with
>
> {{{{0.000000, 0.000000},{0.000100, 0.001614},{0.000300,
> 0.001616},{0.001000, 0.001658},{0.003000, 0.001950},{0.007000,
> 0.003159},{0.010000, 0.005750},{0.030000, 0.031613},{0.050000,
> 0.070769},{0.070000, 0.114838},{0.085000, 0.147682},{0.100000,
> 0.182020},{0.150000, 0.291103},{0.200000, 0.387073},{0.300000,
> 0.547609},{0.400000, 0.672104},{0.500000, 0.766026},{0.800000,
> 0.941105},{0.900000, 0.976170},{1.000000, 1.000000}}}, {20}, {m}}, 1}
>
> in basecurve.c and
>
>
>
> <rdf:li>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</rdf:li>
>
> in the XMP file.
>
> Tschö,
> Torsten.
>
>
>
Hi Torsten,
I used it for a while and indeed it's very similar to the DT basecurve, but
the shadows are a little darker and more detailed. That will be my
standard basecurve, thanks a lot.
--
Hasta proxima
Bartokk
Gpg public key: 0x73E5AEA3
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