Path: utzoo!utgpu!jarvis.csri.toronto.edu!cs.utexas.edu!samsung!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: info on Kodak colour separation filters Keywords: Kodak Wratten filters, colour separation Message-ID: <5442@udccvax1.acs.udel.EDU> Date: 7 Jan 90 04:32:33 GMT References: <720004@hpvcfs1.HP.COM> <1941@hydra.riacs.edu> Reply-To: cygnus@vax1.acs.udel.EDU (Marc Cygnus) Followup-To: comp.graphics Distribution: na Organization: The Lab Rats Lines: 39 In article <1941@hydra.riacs.edu> hitchner@same (Lew Hitchner) writes: > > The filters you should buy are called wratten filters. These are not > available at most retail photo shops, but should be available from photo > supply companies, direct from Kodak or another photo industry co., or > possibly at larger printing or copying businesses. Wratten filters are... > > > Lew Hitchner Quite correct, Lew. Perhaps the following information would be of use to those of you wishing to investigate colour digitisation: The following filters are excellent for any work involving colour imaging and/or projection. They are classified as 'colour separation filters': Kodak Wratten gelatine filters (you can get glass, but I chose the gels) No. 29 (red) #149 5621 \ No. 61 (green) #149 5894 +-- Kodak catalogue #s for 75mm x 75mm No. 47 (blue) #149 5787 / I have had consistently good results using these gels. Also, Voss Pro- fessional makes a nifty gelatine holder that fits any lens assembly from 50mm on down (and has two adjustable barn doors, too :-). Two rubber - padded leaf springs part under finger pressure, then you place over the lens and let go... easy to insert/remove gels (there's a plate that slides into the assembly; push it out from the bottom and it brings the gel out with no fingerprints). Aaaaaaaanyway... Now, if I could only get my hands on a good CHEAP semi-hiresolution CCD element camera with RGB (or composite) output... -marcus- -- ----------------------------------------------------------------------------- "Opinions expressed above are not necessarily those of anyone in particular." `...but do YOU own a | ARPA: cygnus@vax1.acs.udel.edu homemade 6ft Tesla?' | UUCP: {yourpick}!cfg!udel!udccvax1!cygnus