[hylafax-users] Some TIFF's have bad pages

[Dustin Puryear <dpuryear@usa.net>]

Very rarely (I would say less than 1%) we have a TIFF delivered by Hylafax 
that isn't quite right. Even though this rarely happens, one time is one 
time too many, as this is a business environment that lives by faxes (and a 
high volume of them at that), so a lost fax is BAD.

The problems with the TIFF images seem to be of the following types:

o One page may be viewable, but other pages cause the viewer to report 
"Invalid compression type," and then exit.
o One page or so may be viewable, and there may or may not be garbage (ie., 
slanted horizontal lines) at the bottom of the page. The next page appears 
to be cut-off, like only a bit of the page made it through. The viewer 
doesn't report an error, but the fax is definitely funky. I'd say this was 
the sending fax maybe, but the garbage at the bottom of one page and the 
top don't look like a normal bad fax where paper might have jammed or 
something, and there doesn't seem to be a pattern of originating senders.
o On a few faxes, we get half a page. Literally, the TIFF only takes up 
half the screen and it looks like the bottom half of the image was just cut 
out. The viewer shows grey, so I assume the TIFF just ends halfway through.

We are using the Kodac viewer "Imaging for Windows Preview," Hylafax 
hylafax-4.1-1rh6, libtiff-3.5.5-2, RH6.2, and the MultiTech multiport modem 
cards with driver 'ISICOM version 3.05'.

I remember digging around a while ago, and found something about Kodac 
viewers and TIFF compression types causing problems? I can't remember where 
I found that link! Anyway, if this were the case, wouldn't all attempts to 
view a fax fail?

Regards, Dustin

---
Dustin Puryear <dpuryear@usa.net>
UNIX and Network Consultant
http://members.telocity.com/~dpuryear
PGP Key available at http://www.us.pgp.net
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