Path: utzoo!utgpu!watserv1!watcgl!imax!dave
From: dave@imax.com (Dave Martindale)
Newsgroups: comp.graphics
Subject: Re: Color scanning (Wratten Filters for Separation Work)
Keywords: Kodak Wratten filters, colour separation
Message-ID: <1990Jan11.032118.10169@imax.com>
Date: 11 Jan 90 03:21:18 GMT
References: <720004@hpvcfs1.HP.COM> <1941@hydra.riacs.edu> <5442@udccvax1.acs.udel.EDU> <12887@watcgl.waterloo.edu>
Reply-To: dave@imax.com (Dave Martindale)
Distribution: na
Organization: Imax Systems Corporation, Oakville Ontario
Lines: 26

In article <12887@watcgl.waterloo.edu> awpaeth@watcgl.waterloo.edu (Alan Wm Paeth) writes:
>
>If someone has a copy of the Kodak Wratten filter book on hand perhaps they can
>furnish numbers on the cutoff points? It would be nice to know the whole truth.


Here are the figures for various interesting filters.  I've shown the
approximate wavelengths where transmission falls to 10% and 1%
(OD 1.0 and 2.0).  Wavelengths are in nanometers:


Wratten #       1%      10%     peak    10%     1%      peak transmission (%)

25              580     590                                     89
26              590     600                                     89
29              600     610                                     90

47              380     400     440     500     520             50
47B             380     400     430     470     490             50
48              400     420     460     490     510             33

58              480     500     530     580     600             54
61              480     500     520     570     600             40


	Dave Martindale