Re: Question about HylaFAX - pdf to fax conversion

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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