----- Original Message ----
> From: Valter Prahlad <[email protected]>
> > Most multi-page documents (.pdf's or even M$ Word docs) print at the
> > usuall
>30
> > to 80 page/minute even if they large color files. I wonder why these small
>B/W
> > .tif scans take so long?
>
> It might be because they are probably compressed TIFFs, so the actual
> (uncompressed) data si much bigger (let's say some megabytes uncompressed vs
> 60 kylobytes compressed?).
> If the printing sends the uncompressed image binary data, it'll take some
> time...
>
Yes, that explains it.
So I ran some tests for the Geke minded.
The test file was 76 KB in its original configuration. This is the size is
from" Get Info" in Preview as the default viewer in 10.4.11. When saved as
uncompressed it grew to 8.1 MB. When saved again with LZW compression it was
220
KB.
When I changed the default application to PhotoShop the original file grew to
144 KB. When saved as uncompressed it grew to only 1.1 MB. A lot less than 8.1
MB file from Preview . When saved with LZW compression in PS it dropped to 236
KB and when saved with ZIP compression it was 212 KB.
Certainly many different file sizes. And I don't have a clue why.
I wonder what compression was used originally to get the file to 76 KB? It
would
be a lot more efficient to store or email a 76 KB files than 200+ KB files if
we
could do that in an OSX environment.
The file is a 1 bit/channel B/W (line art) not 8 bit greyscale. I assume the
scans were done on a commerical high speed document scanner in a Windows
environment. Perhaps the same scanner is also compatible with Mac OSX. I would
love to get my letter size 1 bit .tiff scans down to 70-100 KB compressed size
but then I only using inexpensive flatbed scanners.
Just a FYI report. --glen
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