Re: Hardcore Computist Magazine online...

[salfter@salfter.dyndns.org.is.invalid (Scott Alfter)]

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In article <4033ab00$0$5691$45beb828@newscene.com>,
Michael Maginnis  <michaelmaginnis@yahoo.com> wrote:
>wseehorn@earthlink.net wrote:
>> I do scanning of PDF in the WinDoze world. In that version of Acrobat
>> if you use PDF distiller or PDF writer (from the Print menu) & select
>> screen resolution you cut down the file size considerably.
>
>Still can't get the file size per page down below 1 MB or so. Too large 
>for this project.

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.

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