Re: [hylafax-users] 11x17 & Resolution

[Jayson Henkel <jhenkel@xxxxxxxxxxxxxxxx>]

Hello,

I just noticed Hylafax 4.1.8 is in unstable I'll try that.

On Wed, 2003-12-17 at 15:26, Lee Howard wrote:
> On 2003.12.17 13:52 Jayson Henkel wrote:
> > Hello everyone,
> > 
> > I have a sample hylafax server setup and receiving faxes nicely. Yay!
> > However, I have a few questions:
> > 
> > 1.) Are there any caveats to receiving 11x17 faxes (a technical
> > drawing), I have  been able to receive them but their seems to be a
> > small border that chops off the edge's of the page.
> 
> I would be interested in seeing some of these session logs, if you can 
> send them.  So much of faxing is done in A4, letter, and legal sizes 
> that I'd love to see something different.  Also the faxinfo output 
> against the received TIFF would be lovely.
> 
> > Is this the source
> > fax causing the problem or some config setting within hylafax?
> 
> Fax protocol (T.30) basically supports only three different page 
> widths: A4 (215 mm), B4 (255 mm), and A3 (303 mm).  Here's a table from 
> 'man gs':
> 
>         PAPERSIZE    X inches   Y inches   X cm      Y cm
>         -----------------------------------------------------
>         a3           11.6944    16.5278    29.7039   41.9806
>         a4           8.26389    11.6944    20.9903   29.7039
>         b4           9.84722    13.9167    25.0119   35.3483
> 
>         letter       8.5        11         21.59     27.94
>         legal        8.5        14         21.59     35.56
>         11x17        11         17         27.94     43.18
> 
> Because fax protocol also allows for unlimited page length, the last 
> three page sizes there can be "approximated" by using A4 for legal and 
> letter and then using A3 for 11x17.  The length won't matter, but on 
> "legal" and "letter" faxes there's going to be 1/4" missing 
> horizontally.  Likewise, with an "11x17" fax there's going to be nearly 
> 1/2" missing horizontally.
> 
> In other words, the "small border" that's being chopped off is probably 
> to be expected, as long as we're talking about an image loss of about 
> 1/2".  If it's more than that... well, then that will take some 
> investigation.  If the 1/2 inch is critical, then you may want to see 
> if you can get your senders to scale down to and send with A3 size 
> rather than 11x17.
> 
> > 2.) For the aforementioned  technical drawing is there settings within
> > Hylafax that affect the print quality? There appears to be some
> > quality
> > differences between a "true" fax and the hylafax rendering. This is
> > using "Super-fine" on the source fax and 600x600 dpi (max available)
> > on
> > the output printer (an HP 5000). Is there any way of improving the
> > output quality? Especially for very small text.
> 
> HylaFAX CVS HEAD (to be 4.2.0) supports extended resolutions 
> (particularly in Class 1 - only in Class 2 if your modem supports it) 
> which include ~200x400 dpi (often called superfine), 300x300 dpi, and 
> ~400x400 dpi (often called hyperfine).  Pre-4.2.0 HylaFAX releases will 
> only support normal (~200x100 dpi) and fine (~200x200 dpi); thus you're 
> currently losing resolution - probably half the vertical resolution.
> 
> As resolution increases so does the risk of encountering some corrupted 
> image data.  For this reason ECM (error correction) is recommended with 
> extended resolution faxing.  HylaFAX CVS HEAD also fully supports ECM 
> in Class 1.  (ECM in Class 2 is already supported if your modem also 
> supports it.)
> 
> > If it helps I am using 4.1.1-3  (Debian versioning) on Debian Stable.
> 
> Judging that the current HylaFAX version is 4.1.8 and 4.1.1 was 
> released nearly two years ago, I suspect that it will be a very long 
> time after release before 4.2.0 ever makes it to Debian Stable... you 
> may want to look into independent upgrade options if these features are 
> useful to you.
> 
> Lee.
> 
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-- 
Regards,

Jayson D. Henkel
Systems Manager

(Tel:  +1 (780) 440-4434)
(Fax:  +1 (780) 440-1951)
(Cell: +1 (780) 886-8941)
(E-Mail: jhenkel@xxxxxxxxxxxxxxxx)

Sterling Crane
P.O. Box 8610. Station South
Edmonton, Alberta
Canada. T6E 6R2

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