Re: [hylafax-users] hfaxd pdf2fax image quality

[Lee Howard <faxguy@xxxxxxxxxxxxxxxx>]

Your printer most likely has a print resolution of 600 dpi or better.  
So the print driver or rendering engine within the printer itself can 
make use of that high resolution to dither the non-monochrome parts of 
the image with significantly more gradation than Ghoscript can when 
dithering to a resolution of 100 or 200 dpi.

That said, there probably could be some improvements to Ghoscript in 
this regard.  See "Color Printing in Ghostscript"

  http://tldp.org/HOWTO/Printing-HOWTO/ghostscript.php

And, no, in my experience -dDOINTERPOLATE and -dDITHERPPI=x do not help 
at all.

Lee.


Steven Jardine wrote:

> OK.  I guess my big concern is that if I print the pdf out on my laser 
> printer and then fax it, the quality is much better than faxing it 
> directly from hylafax.  I understand the no grayscale but it seems 
> like I should get similiar quailty.  Is this right?
>
> Michael Stowe wrote:
>
> > Greyscale images aren't likely to look good unless they're dithered or
> > halftoned -- FAXes don't do greyscale.
> >
> >  
> >
> > > I am working on sending a pdf document using hfaxd.  The pdf document
> > > contains images that when converted to ps/tiff look very grainy.  The
> > > pdf file / images are all grayscale.  I am using a Mandrake Linux 10.1
> > > with hylafax+ 5.1.3.  My question is ... is there a way to increase the
> > > quailty?  Thanks in advance.
> > >
> > > Steve
> > >     
>
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