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viewfax(1)			Local commands			    viewfax(1)

NAME
       viewfax - display fax files in an X11 window

SYNOPSIS
       viewfax	 [-fnluirvW24]	 [-hheight]   [-wwidth]	 [-zzoom]  [-ddisplay]
       [-gwxh+x+y] [-bbell] [-mmemory] filename...

DESCRIPTION
       viewfax displays	one or more fax	files in an  X11  window.   The	 input
       files may be either raw,	single-page faxes received by a	fax modem with
       a program such as mgetty(1), or tiff files such as those	 used  by  hy-
       lafax.  The first (or only) page	of "PC-Research"-style (DigiFAX) files
       produced	by the ghostscript dfaxhigh or dfaxlow	drivers	 can  also  be
       displayed.

       Input  files using any common fax encoding such as group	3 (1 and 2 di-
       mensional) and group 4 can be displayed.

       The fax images are rendered at full resolution  and  then  successively
       scaled down by a	linear factor of 2 prior to display, until they	fit on
       the screen.  The	display	can be controlled  interactively  using	 mouse
       and  keyboard  commands.	  The left mouse button	expands	the image by a
       factor of two and the right button reduces it by	the same  factor.   If
       the  image  is  bigger than the available window	size, the middle mouse
       button can be used to reposition	it within the window.  Hold  down  the
       middle button while dragging the	image to its new position.

       If the mouse has	a scroll-wheel it can be used to move an oversized im-
       age vertically.	With  the  shift  key  depressed,  the	wheel  scrolls
       through	the  pages.  The shift sense is	inverted if viewfax is started
       with -W on the command-line.

       Further interaction is controlled by single-key commands:

       h or Help
	      displays a page of help information.  Type 'q' to	return to  the
	      original document.

       p or Prior or PgUP or - or BackSpace
	      displays the previous page from the command-line list.

       n or Next or PgDn or + or space
	      displays the next	page from the command-line list.

       Shift HOME
	      displays the first page from the command-line list.

       Shift END
	      displays the last	page from the command-line list.

       z      zoom in (same as right mouse button).

       Shift Z
	      zoom out (same as	left mouse button).

       u      turns  the  image	 upside	 down,	which is useful	if the fax was
	      originally fed the wrong way into	the machine.

       Shift U
	      turns this and all following pages upside	down.

       l      turns the	image through 90 degrees, to view landscape text.

       Shift L
	      turns this and all following pages sideways.

       m      produce a	left/right mirror image	of the page.

       Shift M
	      mirror this and all following pages.

       cursor arrows
	      reposition the displayed image if	it exceeds the window size.

       HOME   repositions so that the top left corner is visible.

       END    makes the	bottom right corner visible.

       Print  if the environment variable VIEWFAX_PRINT	is defined,  the  cur-
	      rent page	is printed.  All pages are printed with	Shift Print.

       e      if the environment variable VIEWFAX_EDIT is defined, the current
	      page is passed to	the editor.  All input	files  can  be	edited
	      with Shift e.

       q      terminates the program.

       Shift Q
	      terminates  the  program with non-zero exit status.  Can be used
	      to abort a shell script, e.g. when the  user  is	previewing  an
	      outbound fax and decides not to send it.

OPTIONS
       viewfax is designed to "do the right thing" when	given just a filename.
       Special cases can be handled with the following	options.   (Note  that
       tiff-files contain a header which overrides the -f, -n, -h, -w, -l, -m,
       and -u flags.)

       -f     indicates	 that  raw  input  files  are  fine  resolution	  (7.7
	      lines/mm)	faxes.	This is	the default unless the filename	begins
	      with "fn".  Tiff and "PC-Research"  (DigiFAX)  files  are	 self-
	      specifying.

       -n     indicates	 that  raw  input  files  are  normal resolution (3.85
	      lines/mm)	faxes.	Each fax line is duplicated in	the  displayed
	      image  to	 give  approximately  equal  vertical  and  horizontal
	      scales.

       -hheight
	      specifies	the number of fax lines.  If this option  is  missing,
	      viewfax counts the number	of lines in the	input file.

       -wwidth
	      specifies	 the  number of	pixels in each scan-line.  The default
	      value is 1728.

       -l     display in landscape mode.

       -u     turn the image upside down.

       -i     invert pixels (black/white).

       -b     preferred	warning	style: 'a' for audible	bell  (console	beep),
	      'v'  for	visible	bell (flash the	window), 'n' for neither.  'v'
	      is the default.

       -d or -display
	      use specified X server

       -g or -geometry
	      the preferred size and position  of  the	window,	 specified  as
	      widthxheight+x+y.	  If  a	 position  is  given (x	and y values),
	      viewfax asks the window manager to place the window there.   The
	      initial  size of the window is constrained to be at most widthx-
	      height.

	      If the window is subsequently resized due	to the user zooming in
	      or out, the geometry is taken as a constraint on the screen area
	      which may	be used	by viewfax.

	      If you do	not supply a geometry  value,  everything  works  fine
	      with  ICCCM-compliant  window  managers like olwm, mwm, twm, and
	      tvtwm.  When fully zoomed	out the	viewfax	window will occupy the
	      entire screen.

	      Users of fvwm will notice	that the title bar and left border are
	      moved off	screen when viewfax repositions	the window  to	(0,0).
	      A	 workaround  is	 to  use -geometry +5+23 when using fvwm.  The
	      proper fix would be for someone to update	the routine HandleCon-
	      figureRequest()  in  fvwm/events.c  to correspond	to the code in
	      twm/events.c.

       -mmemory	limit
	      each page	is kept	in memory after	being  fetched	and  expanded,
	      which  saves time	if the user returns to it in the same session.
	      To prevent viewfax from using all	the available  swap  space,  a
	      limit  is	 placed	 on the	total size of cached images.  This de-
	      faults to	4 MBytes, enough for about 6 typical  pages.   If  the
	      memory  limit  is	exceeded, old images are discarded and must be
	      reloaded from disk if the	user returns to	them.	The  operation
	      of  this	mechanism is transparent apart from the	occasional de-
	      lays due to reloading.  The value	specified on the command  line
	      can be suffixed k	or m for kilo- or megabytes.

       -r     the  bit	order of the bytes in the input	file is	reversed.  The
	      fax specification	deals only with	serial data transmission.  Mo-
	      dem  manufacturers have to decide	whether	the first bit received
	      should be	placed in the most significant or the  least  signifi-
	      cant position in a byte.	The consensus is to pack most signifi-
	      cant first, but the -r flag is available to deal with the	 oppo-
	      site order.

       -v     produce some informative messages	(verbose mode).

       -zzoom specifies	an initial zoom	factor.	 A full-scale fax will usually
	      not fit on the screen.  If the -z	option is not specified, view-
	      fax scales the image by a	power of 2 such	that it	is fully visi-
	      ble at a reduced size.  The user can then	use the	mouse  buttons
	      (see above) to view expanded portions of the image.

       -2     Assume that raw input files use group 3 two dimensional coding.

       -4     Assume  that  raw	input files use	group 4	coding.	 The number of
	      fax lines	(-h option) is required	in this	case.

ENVIRONMENT
       VIEWFAX_PRINT
	      Defines a	command	that will print	one or more fax	pages.

       VIEWFAX_EDIT
	      Defines a	command	that will calls	an editor on one or  more  fax
	      pages.

       These two variables are optional.  If a variable	is undefined, the cor-
       responding keyboard command is ignored.	If the variable	is defined, it
       should contain the name of a command or executable script that performs
       the desired function.  The command should  process  a  single  page  if
       called with a -p	page-number argument.  Alternatively, if can be	called
       with just a list	of filenames, meaning that all pages  should  be  pro-
       cessed.

       Here is an oversimplified example of a print command.  Note that	it as-
       sumes that the format is	tiff and will fail when	handed a raw fax file.
	 VIEWFAX_PRINT=printfax

	 /usr/local/bin/printfax:
	 #!/bin/sh
	 case "$1" in
	 -p) shift
	     dopt=`expr	$1 - 1`
	     shift
	     tiff2ps -d	${dopt}	-2 -h 11.69 -w 8.27 "$1" | lp
	     ;;
	 *)  tiff2ps -2	-h 11.69 -w 8.27 "$*" |	lp
	     ;;
	 esac

SEE ALSO
       mgetty	(http://alpha.greenie.net/mgetty/)   controls	data/fax/voice
       modems.

       hylafax	(http://www.hylafax.org/) is a full-function fax client/server
       system.

       g3topbm(1) and xv(1) can	be used	in a pipeline  to  view	 faxes.	  This
       will usually be slower than using viewfax, but xv has many capabilities
       for manipulating	the image and saving it	in other formats.

       faxview.tcl,		  (ftp://ftp.leo.org/pub/comp/os/unix/network-
       ing/mgetty/faxview.tcl.gz)  a simple dialog for viewing FAX messages by
       Ralph Schleicher	(rs@purple.in-ulm.de).	This is	a  useful  tool	 which
       provides	a file menu from which incoming	faxes can be selected for dis-
       play with viewfax.

       CCITT (now ITU) Recommendation T.4, Standardization of Group 3  Facsim-
       ile Apparatus for Document Transmission.

       CCITT (now ITU) Recommendation T.6, Facsimile Coding Schemes and	Coding
       Control Functions for Group 4 Facsimile Apparatus.

BUGS
       The user	interface does not comply with any known style guide.
       The help	text looks moth-eaten because it is encoded as	a  fax.	  This
       avoids dealing with X11 fonts.
       The program does	not refer to the X resources database.

AUTHOR
       Frank D.	Cringle	(fdc@cliwe.ping.de).

Frank's	Hacks		       14 November 2004			    viewfax(1)

NAME | SYNOPSIS | DESCRIPTION | OPTIONS | ENVIRONMENT | SEE ALSO | BUGS | AUTHOR

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