[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 

Iliah Borg

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