Re: [hylafax-users] Scanner to fax resolution problem

["Frank Millman" <frank@xxxxxxxxxxxx>]

Aidan Van Dyk wrote:
> 
> * Frank Millman <frank@xxxxxxxxxxxx> [090107 03:58]:
>  
> > So far everything works ok, with the exception that 
> documents scanned 
> > on Fedora and faxed to Windows come out with a poor 
> resolution. I am 
> > using the built-in xsane gui front end, but if I use the 
> sane cli, I 
> > get the same result.
> 
> HylaFAX uses Ghostscript to "re-render" tiff images that 
> aren't the correct size/resolution/format for direct fax transmission.
> 
> My guess is that the image isn't right for direct FAX (T.30) 
> sending, and the ghostscript middle-man is the culprit.
> 
> You can see the tiff2fax command executed in syslog if you 
> turn up faxq logging, and running it by hand (and with -x) 
> will show you the GS running to squash the bad-sized tiff to 
> the right-sized tiff (and then you can verify that it's the 
> GS making the right-sized tiff look bad).
> 

Thanks, Aidan. I did this, and I can confirm that the resulting tiff file
has the bad resolution, so tiff2fax must be the culprit.

> Another option would by to try and get SANE to scan to the 
> right format, I think your best bet is to try and get it to match:
> 
> Horizontal: RES of 204(pi), 1728 pixels wide *exactly*
> Vertial:    RES of 196(pi), variable length (as long as your 
> receiver accepts it,
>                  otherwise around 2150 - 2300 pixels for letter/A4
> 

There does not seem to be an option to specify horizontal and vertical
resolution separately.

I read somewhere that one should use '--mode LineArt' for faxing. I tried
this, the resulting image was smaller, and it faxed without loss of
resolution, but the scan itself lost a lot of detail. The pre-printed form
is a light blue, so some of the lines and boxes, and some of the
handwriting, did not come out at all! Windows does not have this problem, so
I don't think that is the answer.

I will ask on the 'sane' mailing list for suggestions. I will report back if
I find out anything.

Am I the only one with this problem? I would have thought that there would
be lots of people using sane -> hylafax to scan and fax documents. Perhaps
the scanner is not fully supported - it is quite old. It is a Plustek
OpticPro U24.

Can anyone recommend a scanner where what I am trying to do just works?

Thanks

Frank


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