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Re: Hardcore Computist Magazine online...



Scott Alfter wrote:

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In article <4033ab00$0$5691$45beb828@newscene.com>,
Michael Maginnis  <michaelmaginnis@yahoo.com> wrote:

wseehorn@earthlink.net wrote:


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What bit depth are you using?  24 bpp is severe overkill.  8 bpp (grayscale)
is usually excessive as well.  For most printed matter (halftone instead of
continuous-tone), 1 bpp at 300-600 dpi will do, though you might have to
tweak the thresholds a bit.  What I've done in the past is scan grayscale
and use netpbm to convert to black-and-white.  Multiple pages can then be
stuffed into a single TIFF file with lossless compression of some sort (such
as group 3 fax).  A full page at 300 dpi is about 1 MB compressed, so this
should work out to something a bit less when compressed.

  _/_   Scott Alfter (address in header doesn't receive mail)
 / v \  send mail to $firstname@$lastname.us
(IIGS(  http://alfter.us/            Top-posting!
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I've been doing b&w line art scanning, with the jpg image quality set to low and the contrast turned up to 100% (seems to screen out most of the "bleed through"). Image size is set to 100% at 150dpi - the images are averaging 200K - 300K in size; much better than I'm able to get with PDF. My scanner (Agfa SnapScan Touch) insists on scanning only to it's own software - anything else dies with "Communication Error", so quality OCR software like Omnipage is right out.

--

Mike

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Apple II user since 1983
"Fighting the frizzies at eleven"
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