Article View: comp.lang.postscript
Article #8149Re: Getting 255 Grey Levels
From: Robert Viduya
Date: Fri, 24 Mar 1989 15:42
Date: Fri, 24 Mar 1989 15:42
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> Perhaps it should be added that 255 grey levels aren't very useful for > human 'consumtion' - the eye can't distinguish between more than about > 30-50 levels of grey. Try creating a completely white to a completely black fade effect using only 30 levels of grey. This effect is known as a fountain and using only 30 levels of grey produces an ugly banding instead of the desired smooth transition. robert -- Robert Viduya robert@shangri-la.gatech.edu Office of Computing Services Georgia Institute of Technology (404) 894-6296 Atlanta, Georgia 30332-0275
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!purdue!gatech!prism!robert@shangri-la.gatech.edu.gatech.edu From: robert@shangri-la.gatech.edu.gatech.edu (Robert Viduya) Newsgroups: comp.lang.postscript Subject: Re: Getting 255 Grey Levels Message-ID: <362@hydra.gatech.EDU> Date: 24 Mar 89 15:42:02 GMT References: <1597@murdu.oz> <854@draken.nada.kth.se> <402@helios.prosys.se> Sender: news@prism.gatech.EDU Reply-To: robert@shangri-la.gatech.edu.gatech.edu (Robert Viduya) Organization: Office of Computing Services, Georgia Tech Lines: 15