Re: [hylafax-users] Fax takes long time to send

["Nicolas Ross" <rossnick-lists@xxxxxxxxxxx>]

I've rechecked both PDFs and they don't have anything but white
background. The pdfs generated by our systems are converted to PS with
acroread for linux. This is done because ghostscript have some problems
converting pdfs in some situations.

Then, with our new pdf engine this conversion causes the added noise. 
Deconstructing the postscript file that's beeing sent to hylafax pointed out 
that there's a white image in the background, and previously it was a 
transparent background.

Now, if I take the pdf directly into the fax queue, all comes back to 
normal.

I'll work on thoses pdf that had difficulties passing trough GS...

So, all in all, it's a problem that we didn't see because nobody complained 
that there received faxes contained small dots.

Thanks folks for lighten me up !

Nicolas


> > Visualy, the pdf is almost the same, but converted to postscript and
> > then
> > to tiff via ps2fax, we clearly see where the problem is.
> >
> > http://www.cybercat.ca/~rossnick/fax.gif
> >
> > In this image, you can see on the left the old engine, and on the right
> > the
> > new one...
> >
> > I'll then see how to play with ghostscript options to remove this
> > "noise",
> > that is surely causing the problem...
>
> The "noise" is probably a light grey (or even colour) background in the
> original PDF.  The darkness get's "dithered" by Ghostscript in the
> conversion to monochrome.


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