Corrupted outgoing faxes (linejumps)

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Hi,

Christian Jung wrote:
> > >The received fax on the remote station is corrupted. At two or three
> > >positions, the fax breaks and continous without any space inbetween with
> > >the faximage a few lines before...uhh..you canīt see what i mean - right?
> > >In other words: line1,line 2 and line 3 are printed, the suddenly line 2
> > >appears again, then line 3 and so on. Like a little backwardsjump in the
> > >datastream.
> >
> >Huh? This is very weird. Does that happen with other receiving machines
> >as well?
> 
> Ok, so I had to connect this good old 3M EMT9145-flagship back on line and...
> wow...the fax has been received with NO errors in it! Amazing...seems that
> these Philips guys are producing kinda hickup-faxmachines.

Hmmm. Sounds as if the philips machine sends some capability info to your
modem that it doesn't really handle (e.g., you can send the minimum time
that the sender should take for each scan line - if the sender sends data
too fast, because he gets the timing wrong, it could easily cause the loss
of every second line).

I would *not* blaim the philips machine, unless your modem really works
with *every other fax* out there. In my experience, most fax machines
have pretty good fax G3 implementations, and many modems have very bad
ones (with one exception: HP's JetFax is *very* bad).

> >Actually, I thought that I finally closed that issue, making g3cat fix
> >these problems "on the fly", but it seems that some faxes can't accept
> >a *black* run-length of 0 pixels, and do some "bad things". I will
> >rework that fix...
> >Anyway, for the time being, you can fix your G3 files by piping them
> >through:
> > g3topbm file-in.g3 | pgm2g3 > file-out.g3
> 
> That did not make it for me. The fax is still corrupted on the
> Philips-machine...sorry.

Wrong guess, obviously. If that was the reason, it would have show up on
the 3M as well.

> ...and here is the "-v" diagnostic output of my senior-aged g3view:
> 
> <file>.g3
> height = 2386
> width = 1728
> resolution = fine
> Line 2385: bad RTC (7 EOLs) ??????
> memused = 515376

Looks ok.

gert

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