Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!zaphod.mps.ohio-state.edu!pacific.mps.ohio-state.edu!linac!att!cbnewsj!cbnewsi!hrs1
From: hrs1@cbnewsi.att.com (herman.r.silbiger)
Newsgroups: comp.dcom.fax
Subject: Re: Fine mode in Group III faxes
Summary: using fine mode
Keywords: fax, resolutions
Message-ID: <1991Apr10.144829.4271@cbnewsi.att.com>
Date: 10 Apr 91 14:48:29 GMT
References: <10335@pitt.UUCP> <1281@gammafax.gammalink.com>
Organization: AT&T Bell Laboratories
Lines: 25

In article <1281@gammafax.gammalink.com>, mikes@gammafax.gammalink.com (mike spann) writes:
> In article <10335@pitt.UUCP> jonathan@cs.pitt.edu (Jonathan Eunice) writes:
> >I read in the May, 1991 MacUser that Group 3 faxes have a Standard
> >resolution of 203x98 dpi, and a Fine resolution of 203x196 dpi.  The
> >sample shown (p. 107) makes Fine look *much better* than Standard.  Do
> >most standalone fax machines support the Fine resolution?  
> 
> Fine resolution is technically an option for Group 3 fax machines.  As is
> 9600, 7200 and 4800 bps operation.  In practice, you will have to look
> far to find a machine that does not have fine mode or the higher speeds.
> 
> Sending a fax from a fax machine in fine resolution 'usually' requires the
> user to press a button on the fax machine before sending each fax.  I say
> 'usually' because some fax machines do allow you to set fine mode as the
> default.  Most have standard resolution as the default, requiring the
> sender of the fax to want to spend twice as much to send the fax with higher
> resolution.
>

Since the T.30 protocol allows for renegotiation after evry page, you can go
from normal mode to fine mode between pages.  This is useful if you have only 
one or two pages in  a document that really need the higher resolution, since
invoking high resolution increases transmission time.

Herman Silbiger