manuals in pdf (resolution, compression) - test-drb@ccmp.vtda.org

27 Jun 2004

On Jun 27, 13:59, Tom Owad wrote:
...
  What I'm leaning towards now is making two sets:
one for archiving and
...
  one for distribution.

 The archival images will be 600dpi greyscale TIFFs.  They will not be
 converted to pdf, but just stored as TIFFs.

 The images intended for download and distribution will be 200dpi
 greyscale JPEGs.  Using these, I expect a 128-page download to be about
...
  20 MB.  While perhaps not suitable for ocr, these
images are very
 comfortable to read on-screen, and can later be replaced with improved
...
  versions made from the original 600dpi TIFFs.

 I know a lot of you expressed concerns about JPEGs, but I haven't been
...
  able to get anywhere near the compression using other
methods, for
 greyscale images.  Am I overlooking any options? 
JPEGs are bad news because of the losses.  Personally I find
higher-resolution easier to read (and print, if I want to, which I
often do) and normally greyscale isn't needed.  The last thing I
scanned was a 166-page DEC manual, which came out as 6.4MB of PDF or
6.3MB of G4 TIFFs in a single TIFF file.  That's a lot better than your
20MB JPEG, and higher resolution, too.

-- 
Pete						Peter Turnbull
						Network Manager
						University of York