Scanning old manuals - test-drb@ccmp.vtda.org

9 Mar 1999

Eric Smith wrote:

...
  For pages that consist solely of text and line art,
scan them as 300 DPI
 TIFF Class F Group 4.  That takes only 40-120K per page.  I put the
 resulting images into a PDF file, since most people don't have any other
 G4-capable reader, and G4 is supported as a native PDF image format.
 [...]
 Some results of my scanning can be seen at www.36bit.org. 
The decsystem-1080/1090 manual is quite readable, and the 136-page 12175kB PDF
file averages out to about 89.5kB/page.

Then,
Sergey Svishchev wrote:

...
    Example: 39-page A4-size document scanned at 300dpi
is 1.5 MB in TIFF
   format (Group 4 Fax compression), 84 MB in Level 1 PostScript (PStill
   does not grok Level 2 PostScript produced by tiff2ps.)

   Result: 3.5 MB PDF (could be less, if PStill used CCITTFaxEncoding.) 
That comes to about 89.7 kB/page, which agrees with Eric's doc above.

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