Article View: sci.image.processing
Article #887Re: Big RGB <-> CMY Problem
From: Carsten Salewski
Date: Tue, 05 Jan 1993 14:57
Date: Tue, 05 Jan 1993 14:57
27 lines
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1269 bytes
In article 1522@tom.rz.uni-passau.de, friedric@diogenes.uni-passau.de (Carsten Friedrich) writes: > >I have a big problem converting colors from cmy to rgb and vice versa. >The usual aproach, to just invert the components seems to be incorrect. > (...) > >carsten Did you try this: R = V/cv + Y B = U/cu + Y G = (Y - 0.299 R - 0.114 B) / 0.587 Probably you forgot these constants cv = 0.493 and cu = 0.877. Reference: "Fernsehtechnik; Bd. 2: Systeme und Komponenten zur Farbbilduebertragung", Broder Wendland, Hartmut Schroeder, Huethig Buch Verlag Heidelberg. pages 51-53. Carsten Salewski email: salewski@helios.tnt.uni-hannover.de
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<1993Jan5.145712.10249@newsserver.rrzn.uni-hannover.de>Path:
arc1-ca.pugleaf.net!sparky!uunet!mcsun!Germany.EU.net!urmel.informatik.rwth-aachen.de!solaris.rz.tu-clausthal.de!news!theseus!salewskiReferences:
<1993Jan4.134820.1522@tom.rz.uni-passau.de>Show Full Headers
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Newsgroups: sci.image.processing Path: arc1-ca.pugleaf.net!sparky!uunet!mcsun!Germany.EU.net!urmel.informatik.rwth-aachen.de!solaris.rz.tu-clausthal.de!news!theseus!salewski From: salewski@tnt.uni-hannover.de (Carsten Salewski) Subject: Re: Big RGB <-> CMY Problem Message-ID: <1993Jan5.145712.10249@newsserver.rrzn.uni-hannover.de> Sender: news@newsserver.rrzn.uni-hannover.de (News Service) Reply-To: salewski@tnt.uni-hannover.de Organization: Universitaet Hannover, Theoretische Nachrichtentechnik References: <1993Jan4.134820.1522@tom.rz.uni-passau.de> Date: Tue, 5 Jan 1993 14:57:12 GMT Lines: 27