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Re: filmscanners: Sprintscan 120 and new negative proile scheme

On Tue, 12 Jun 2001 18:54:57 -0400  Dave King (kingphoto@mindspring.com) 

> True, and I'm sure most of us take advantage of that range sometime or
> the other, and goddam grateful for it too:).  But if one had an
> accurate colneg profile, I would think one could get as good first
> results with varying negs scanning as in the darkroom.  Can't really
> blame a profile for not predicting light temp etc variables.

Nope, you are quite right - a profile should classically be just be a 
straight translation mechanism. However... there is a case for a family of 
profiles which characterise the film under a variety of illuminant 
conditions. That seems to be what DH is proposing.

> But a 'profile' scan of the flourescent green chrome would have the
> same problem.  It's going to come up looking pretty much like the
> chrome, for better or worse.  You're still stuck doing alot of work.
> Profiling isn't intended to deal with variables, it's intended to
> establish predictible accurate results under standard conditions. 

Yup. Except with colour neg, there's this whole range of not-very-standard 
conditions which have to be factored in. That's why nobody bothers with 
ICC for colour neg - a single, standard profile really doesn't get you 
very far. However I can forsee the ICC fundamentalists sharpening their 
knives and sparking a terminological Jihad : it may keep the peace better 
to stick with the standard understanding of a single profile, and offer 
preset adjustment macros to cope with the variables - or do as other s/w 
does, rely on adjustments based on white point or whatever.

I now think a lot is possible here, having had to eat my words some months 
ago when I was arguing that manual corrections to colour neg appeared 
mandatory, and could never be done in software because human judgement 
and intent were involved. Just to make me look maximally silly, Ed Hamrick 
 went and added some rather smart correction routines based on white 
point, which generally work extremely well and save me a lot of time.

I'll be interested to see if the Polaroid approach works, and until then 
I'm not doing soothsaying again :)


Tony Sleep
http://www.halftone.co.uk - Online portfolio & exhibit; + film scanner 
info & comparisons


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