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
Received on Sun Jun 27 2004 - 19:35:42 BST