[argyllcms] Re: help with camera profile

  • From: edmund ronald <edmundronald@xxxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Thu, 19 Jul 2012 01:12:37 +0200

when you mean "profile" do you mean Raw or Jpeg? If Raw, which converter?


On Wed, Jul 18, 2012 at 11:24 PM, Alberto Ferrante <
alberto.ferrante@xxxxxxxxxx> wrote:

> Hi all,
> I am trying to build a camera profile for a Canon 5D MKIII and it is
> proving to be much harder than with the other cameras that I profiled in
> the past. I am working on a profile to be used with Ufraw.
> For the other cameras I was using a non-linear profile (gamma 0.45,
> linearity 0.10) built with the following colprof parameters:
> -qu -bn -y -al -nc -u
> With these profiles on the 5D I obtain a profile that works well with
> highlights, but has problems with the black point: the images look foggy
> and they require manual black point compensation. Furthermore, the
> "black" is not black but it has some color cast (if I measure it I get
> something like red 15, blue and green 4). Even more, when using a
> profile obtained with the -u option (which I used with success with
> other profiles) I cannot get any value above around 250 even burning the
> whole image.
> The profile that seems to work best is a linear profile obtained with
> the following colprof parameters:
> -qu -y -am -bn -nc
> Even if it is a bit flat and it brings out a yellish cast in some
> lightning conditions (that can, anyway, be corrected by changing the
> white balance).
> I have tried all the possible profile kinds, both by using the -u flag
> and not using it. I even tried with -U with no success. The black point
> problem is especially annoying and I cannot get rid of it with most of
> the modes (S and m seem to work better than other modes, especially
> without -u).
> Any comment or suggestion related to the problems above (especially the
> one with black point) will be highly appreciated.
> Tanks!
> Regards,
>         Alberto
> --
> Home page: http://www.alari.ch/people/alberto
> Photo galleries : http://albertoferrante.name
> Public key: http://www.alari.ch/people/alberto/keys/yahoo.asc

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