Roger/Rob,
All this calibration/IT8 stuff only applies to positives such as E6 or
prints. Because of the great variabilty in everything concerning negatives
they cannot be profiled in any consistant manner. Also from a profile point
of view all E6 behaves the same because you are characterizing the hardware
with known target and color vakues which is why you don't need a seperate
target for every film.
Insight has a profile included with the software. This profile was generated
by Polaroid Image Science Lab. One could argue you need to "do this yourself
and often" but pratical expierience has not shown that to be true.
Back to negative profiles for a moment, Polaroid ships negative profiles for
many films. These profiles are generated using proprietary technology. When
they work, which is mostly they are very good but when the are bad they are
horrid. The nature of negative profiles.If the negative profile does not
work, bringing the raw scan into Photoshop, applying some gamma and setting
the white points usually gets you back on track.
Regards,'
David
-----Original Message-----
From: Rob Geraghty [mailto:harper@wordweb.com]
Sent: Sunday, August 05, 2001 7:16 PM
To: filmscanners@halftone.co.uk
Subject: filmscanners: IT8 Calibration was Re: filmscanners: I love/hate
SilverFast
Roger wrote:
> Too bad Insight and Vuescan don't support IT-8 calibration.
> That's the only reason I've tolerating this SilverFast
For the purchase price of Vuescan it might be worth trying with the SS4000
just to see how much difference calibration really makes?
It occurs to me to wonder how much difference IT8 calibration on a film
scanner makes? Presumably the IT8 target is an ektachrome slide, so you'd
be calibrating for that type of film. What about negs? What about other
brands of slide? Is the calibration just introducing colour shifts that
will have to be corrected anyway?
Rob
Rob Geraghty harper@wordweb.com
