[argyllcms] Re: help with camera profile

  • From: "Alan Goldhammer" <agoldhammer@xxxxxxxxxxx>
  • To: <argyllcms@xxxxxxxxxxxxx>
  • Date: Wed, 01 Aug 2012 08:50:32 -0400

Yes, the Passport does contain the identical patch, it's just more
convenient and it also has some other valuable tools.  You can also use the
X-Rite software and Adobe Lightroom to do a camera calibration which will be
specific for your camera.  The effects are quite subtle but noticeable.
With respect to the dynamic range of the camera, yes this can be an issue
which is why so much has been written about exposing to the right (ETTR) so
that you move the histogram more towards white clipping.  The problem is
that the camera manufacturers set the software to render the histogram as
they see fit and you may end up losing 1/3 to 1 full stop of information
this way.  Two ways to get around this are 1) bracketing so that you get
several images with a range of exposures or 2) setting your camera up for
Uni-White Balance (UniWB) that will counter what the camera maker has set
up.  You can also extend the dynamic range by HDR as long as you don't go
overboard with wild colors.  Photoshop can do this and there are other
shareware software packages as well.


-----Original Message-----
From: argyllcms-bounce@xxxxxxxxxxxxx [mailto:argyllcms-bounce@xxxxxxxxxxxxx]
On Behalf Of Alberto Ferrante
Sent: Wednesday, August 01, 2012 7:03 AM
To: argyllcms@xxxxxxxxxxxxx
Subject: [argyllcms] Re: help with camera profile

I was actually planning to get a ColorcheChecker Passport: it has pretty
much the same price and it could be useful to me not only for checking the
profile. If I understood well, the 24-patch "classic" target should be the
same as the standard 24, just smaller... Is that correct?

A question I was asking myself: cannot the problems with shadows/highlights
be related with the dynamic range of the camera?
Specifically, the dynamic range of the target is roughly 8 stops (gray
patches from full black to full white on paper). Most cameras, in raw, can
register more than 8 stops of dynamic range and, therefore, the model built
in the profile will not cover directly the missing parts (it may cover them
through some kind of interpolation, that may not correspond to the
reality)... Am I wrong?

Thanks again for the great help!


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