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[OM] Re: Don't cry, just do it! [was Velvia 50 replacement]

Subject: [OM] Re: Don't cry, just do it! [was Velvia 50 replacement]
From: Moose <olymoose@xxxxxxxxx>
Date: Sat, 09 Jun 2007 20:32:03 -0700
Bill Pearce wrote:
> Moose,
>
> Where are you getting IT8 targets for color neg films?
>   
To make a film profile, you take a shot of the printed IT8 target, then 
scan that and create the profile. You are looking for a map of colors on 
the film vs. the IT8 ideal. So the software, in my case, VueScan, 
compares the film scan to the known correct values for each patch and 
makes a list of the variations, which is what a profile is.

An IT8 film target is for creating a scanner profile. I tried to get 
into those waters, but they seemed quite murky, although I do have one 
Ektachrome IT8 35mm target. What I read on the subject seemed to say 
that targets differ on different films, even though each slide comes 
with a calibration file. It all made no logical sense to me.

It seemed to me that if you know the scanner's response to the whole 
range of defined colors on film, it should work for any film image, neg 
or positive. The way the IT8 target is defined, there is no negative 
version, I don't think. Any given color is that color, from a profiling 
point of view, whether its inverse is what will later be viewed or not.

In my case, I gave up on scanner profiling, at least for now, and I 
cheat. My profiles are really for the combination of film and film 
scanner, as I couldn't figure out a proper way to profile the scanner. 
Works fine as long as I don't change scanners. I do think the scanner 
introduces much less variation than do the films.

Moose

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