Re: Question about HylaFAX - pdf to fax conversion

My recommendation would be to upgrade the installation to HylaFAX+.  
But, from the source code hylafax-5.5.7/util/common-functions.sh.in:

     if [ "$DITHERING" = "gs-stocht" ]; then
         $CAT $files | $PS -q \
             -sDEVICE=$device \
             -dNOPAUSE \
             -dSAFER=true \
             -sPAPERSIZE=$paper \
             -dBATCH \
             -r$hres\x$vres \
             "-sOutputFile=$out" \
             $STRIPSIZE \
             $FIXEDWIDTH \
             $AUTOROTATE \
             stocht.ps -c "<< /HalftoneMode 1 >> setuserparams" -
         return
     fi

Thanks,

Lee.


On 01/03/2016 01:31 AM, Ido Diamant wrote:
> Hi,
>
> I think I am using HylaFAX, and not the + version (it's part of the 
> Elastix solution).
> I tried placing the DITHERING in the FaxModify, but no change in the 
> output fax.
>
> Any other suggestion?
> Do you know what's the parameter for ghostscript to use the stochastic 
> mode instead of regular? (I can edit the pdf2fax file and change its 
> parameters to make it better, if I know the right parameters).
>
> thanks,
> Ido
>
> On Thu, Dec 31, 2015 at 7:33 PM, Lee Howard <[email protected] 
> <mailto:[email protected]>> wrote:
>
>     Many people do not appreciate the default dithering that
>     Ghostscript does on color images when producing faxable TIFF images.
>
>     If you're using HylaFAX+ then you can put:
>
>     DITHERING=libtiff-fs
>
>     ... or...
>
>     DITHERING=gs-stocht
>
>     into /var/spool/hylafax/etc/FaxModify, and you'll get a prettier
>     result.
>
>     Thanks,
>
>     Lee.
>
>
>
>     On 12/31/2015 05:49 AM, Ido Diamant wrote:
>
>         Hi,
>
>         I am having a problem with HylaFax through Elastix.
>
>         Faxes are being received correctly, and sent fine. I have a
>         problem with the quality of the fax sent from PDF.
>         e.g. if I send a PDF through the sendfax commandline, or
>         through the Elastix UI, the PDF is being converted to a TIFF
>         for the fax sending using this command:
>
>         /usr/bin/gs -q -sDEVICE=tiffg4 -dNOPAUSE -dSAFER=true
>         -sPAPERSIZE=a4 -dFIXEDMEDIA -dMaxStripSize=0 -dBATCH
>         -r209.10x196 -sOutputFile=docq/doc604.pdf;c1 docq/doc604.pdf.604
>
>         (this is the command that is being ran by the pdf2fax script).
>
>         the output file's quality is very poor, what causes the fax
>         sent to be in poor quality, and sometimes not readable.
>
>         I tried playing with the conversion, and noticed that when
>         using -sDEVICE=tiffgray the file is better, but not able to
>         send it through the sendfax, because its not compressed with
>         Group 3 or Group 4 compression.
>
>         What's the best method to convert pdf2fax so it'll make it
>         black/white but in good quality and sharp, and not bad quality?
>
>         Thanks,
>         Ido
>
>
>


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