[argyllcms] Re: Number of patches - well behaved printer?
- From: Iliah Borg <ib@xxxxxxxxxxx>
- To: argyllcms@xxxxxxxxxxxxx
- Date: Wed, 23 Feb 2011 18:21:11 -0500
Dear Rishi,
On Feb 23, 2011, at 5:43 PM, Rishi Sanyal wrote:
> Iliah,
>
> You mention: "Argyll makes excellent profiles for colour negative
> films, something no other profiler can do (export DNG from vuescan and
> bring it to RPP - and you will see)"
>
> Do you have color targets shot on negative film (I think Fuji used to
> once offer a negative film target) or do you shoot targets yourself on
> film?
For daily outdoors use I shoot ColorChecker Passport - it is good enough to put
the colour response into the ballpark. In the studio I prefer ColorChecker DC.
For film simulation profiles I used a recorder to output the targets (about
5000 patches) onto the film, directly. Those are, of course, film simulations
and very generic, measured right from the film - while for normal use one wants
to scan and make film+scanner profiles. Some of the simulation profiles done
with Argyll are incorporated into RPP.
> If the latter, ideally you'd want the blackest black & the
> whitest white on the grayscale gradient to map to the lowest exposure
> (clear film for a developed negative) & highest exposure (Dmax for
> developed negative) possible on the film, correct?
Actually this is not essential for negative profiling. Most important as far as
my experience goes is to get 18% grey to be exposed and developed
sensitometrically correct. That is to expose using a spotmeter as an indicator,
bracketing +/-2 stops with half a stop difference. Now, if you want very wide
target all you need is to make a composite of 3 exposures, centre, +2, and -2.
Such a target covers the dynamic range of the best negative film I ever
encountered.
--
Iliah Borg
ib@xxxxxxxxxxx
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