Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!mailrus!ames!amdahl!littauer From: littauer@uts.amdahl.com (Tom Littauer) Newsgroups: comp.graphics Subject: Re: Color scanning from B&W scanner problem Summary: Roscolux works well, and low cost Message-ID: Date: 5 Jan 90 23:49:21 GMT References: <720004@hpvcfs1.HP.COM> <1990Jan5.190700.28712@ug.cs.dal.ca> Reply-To: littauer@amdahl.uts.amdahl.com (Tom Littauer) Organization: Amdahl Corporation, Sunnyvale CA Lines: 24 In article <1990Jan5.190700.28712@ug.cs.dal.ca> legrady@ug.cs.dal.ca.UUCP (Tom Legrady) writes: > >Roscolux produces colour filters for theatre, video and cinematic use. They >make a large assortment of colours, and the sample books include a graph >of the absorption spectrum ( very approximate! ). Check "Theatrical Equip- >ment and Supplies" in your Yellow Pages (tm). > >Note that some of these may be overkill. Their darkest blue passes only >about 1%. > >It may be better to use some filter that passes a wider range of colours >and do some processing on the resulting data. I have actually done this (although with B/W cameras) and it works just fine. Also note the the sheets are ~ 20" X 24" and ~ $5 each. Lee makes equivalent stuff for the UK readers. -- UUCP: littauer@amdahl.amdahl.com or: {sun,decwrl,hplabs,pyramid,ames,uunet}!amdahl!littauer DDD: (408) 737-5056 USPS: Amdahl Corp. M/S 278, 1250 E. Arques Av, Sunnyvale, CA 94086 I'll tell you when I'm giving you the party line. The rest of the time it's my very own ravings (accept no substitutes).