Path: utzoo!utgpu!jarvis.csri.toronto.edu!rutgers!usc!zaphod.mps.ohio-state.edu!think!ames!haven!udel!udccvax1!cygnus
From: cygnus@vax1.acs.udel.EDU (Marc Cygnus)
Newsgroups: comp.graphics
Subject: Re: Color scanning from B&W scanner problem
Summary: hmm... one point about using scanners
Keywords: don't do colour with bw scanners
Message-ID: <5443@udccvax1.acs.udel.EDU>
Date: 7 Jan 90 04:43:05 GMT
References: <720004@hpvcfs1.HP.COM> <1941@hydra.riacs.edu> <5442@udccvax1.acs.udel.EDU>
Reply-To: cygnus@vax1.acs.udel.EDU (Marc Cygnus)
Followup-To: comp.graphics
Distribution: na
Organization: The Lab Rats
Lines: 22


I just noticed the subject line :-)

I don't recall if this has been said before, but it's probably a good
idea if you not waste your time trying to force a BW scanner to do
colour. Besides the fact that the lightsource is probably not a good
wideband source, and alignment is _ridiculous_ (unless you tape your
source image to the underside of the scanner's bedcover... yuck), you
should keep in mind that the light will have to pass through the filter
_twice_.

When doing camera work with colour separation filters, it's suggested
that 2 f-stops of compensation be used with the filter (and that's when
the light only passes through once).

					-marcus-

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