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

[Lee Howard <faxguy@xxxxxxxxxxxxxxxx>]

Frank Millman wrote:
>     scanimage --mode Gray --resolution 200 --format tiff -x 215 -y 297 |
> sendfax -n -m -d 1234567

Don't use --mode Gray.  You want monochrome output.  Hopefully your 
scanner device can produce monochrome (black and white) instead of 
grayscale.

Because faxing is done in monochrome if you supply an image to HylaFAX 
that is not monochrome then HylaFAX will invoke Ghostscript to render it 
into monochrome, and Ghostscript will have to "dither" the image.  By 
default Ghostscript does a very poor job of this.

Because you're using HylaFAX+ you have certain script features available 
already.  You can improve the dithering behaviors greatly by putting 
this into /var/spool/hylafax/etc/FaxModify:

DITHERING=libtiff-fs

However, it is my recommendation to use the scanner to convert to 
monochrome rather than making HylaFAX do the dithering.

Thanks,

Lee.


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