Path: utzoo!mnetor!uunet!lll-winken!lll-lcc!ames!umd5!purdue!i.cc.purdue.edu!j.cc.purdue.edu!pur-ee!iuvax!inuxc!inuxf!matt
From: matt@inuxf.UUCP (Matt Verner)
Newsgroups: comp.graphics
Subject: Color scanning of negatives
Message-ID: <333@inuxf.UUCP>
Date: 2 Feb 88 17:08:31 GMT
Organization: AT&T Consumer Products, Indianapolis
Lines: 16

I am looking for references that indicate the proper way to convert
'negative' RGB information to 'positive' RGB.  In other words if
I take a film negative and scan it into an image using a color
scanner what formula do I use to convert the image into a positive,
properly color balanced, image?  The key here is proper color balance.

Do I just subtract from the highest R, G or B value (255 in my case).
or is it more correct to do a gamma correction on each value?

Thanks for any help...

 Matt Verner   				UUCP:  ...ihnp4!inuxc!matt
 AT&T Graphics Software Labs		AT&T:  (317) 844-4364
 Indianapolis,  IN

           "The whole point of this sentence is to clearly
             explain the point this sentence is making."