Path: utzoo!attcan!uunet!wuarchive!zaphod.mps.ohio-state.edu!samsung!cs.utexas.edu!rice!uupsi!sunic!liuida!prosys!ath
From: ath@prosys.se (Anders Thulin)
Newsgroups: comp.text
Subject: Re: Please Post Responses (Was: Re: Inquiry about closeout scanners
Message-ID: <532@helios.prosys.se>
Date: 26 Jul 90 18:05:29 GMT
References: <2313@nic.MR.NET> <676@venice.SEDD.TRW.COM>
Organization: Telesoft AB, Teknikringen 2A, S-583 30 Linkoping, Sweden
Lines: 21

In article <676@venice.SEDD.TRW.COM> ries writes:
>                                                The point being that if you
>can only print 15 different grey-scales, what good is a 256 grey-scale scanner.
>Similar args might be made for a scanner supporting more that 300dpi if
>your printer is limited to 300dpi.  
>
>Anyway, Is this hogwash or ?   

If you scan only in order to print it out on a 300 dpi printer, it's 
probably true.

If scan in order to examine the result on a monitor it is not. The eye
can distinguish between 30-50 (?) levels of grey.

And if you scan in order to do image processing (enhancement, filtering)
you definitely want as many grayscales as possible.


-- 
Anders Thulin       ath@prosys.se   {uunet,mcsun}!sunic!prosys!ath
Telesoft Europe AB, Teknikringen 2B, S-583 30 Linkoping, Sweden