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XPR(1)			    General Commands Manual			XPR(1)

NAME
       xpr - print an X	window dump

SYNOPSIS
       xpr  [  -device	devtype	] [ -scale scale ] [ -height inches ] [	-width
       inches ]	[ -left	inches ] [ -top	inches ] [ -header string ] [ -trailer
       string ]	[ -landscape ] [ -portrait ] [ -plane number ] [ -gray ] [ -rv
       ] [ -compact ] [	-output	filename ] [ -append filename ]	[  -noff  ]  [
       -split  n ] [ -psfig ] [	-density dpi ] [ -cutoff level ] [ -noposition
       ] [ -gamma correction ] [ -render algorithm ] [ -slide ]	[ filename ]

DESCRIPTION
       xpr takes as input a window dump	file produced by xwd(1)	and formats it
       for  output  on PostScript printers, the	Digital	LN03 or	LA100, the IBM
       PP3812 page printer, the	HP LaserJet (or	other PCL printers), or	the HP
       PaintJet.   If  no  file	argument is given, the standard	input is used.
       By default, xpr prints the largest possible representation of the  win-
       dow  on	the  output  page.   Options allow the user to add headers and
       trailers, specify margins, adjust the scale and orientation, and	append
       multiple	 window	 dumps to a single output file.	 Output	is to standard
       output unless -output is	specified.

       Command Options

       -device devtype
	      Specifies	the device on which the	file will  be  printed.	  Cur-
	      rently supported:
		   la100  Digital LA100
		   ljet	  HP  LaserJet series and other	monochrome PCL devices
			  such as ThinkJet, QuietJet, RuggedWriter, HP2560 se-
			  ries,	and HP2930 series printers
		   ln03	  Digital LN03
		   pjet	  HP PaintJet (color mode)
		   pjetxl HP  HP  PaintJet  XL	Color  Graphics	Printer	(color
			  mode)
		   pp	  IBM PP3812
		   ps	  PostScript printer

	      The default is PostScript.  -device lw (LaserWriter) is  equiva-
	      lent  to	-device	ps and is provided only	for backwards compati-
	      bility.

       -scale scale
	      Affects the size of the window on	 the  page.   The  PostScript,
	      LN03, and	HP printers are	able to	translate each bit in a	window
	      pixel map	into a grid of a specified size.  For example each bit
	      might  translate	into  a	 3x3 grid.  This would be specified by
	      -scale 3.	 By default a window is	printed	with the largest scale
	      that will	fit onto the page for the specified orientation.

       -height inches
	      Specifies	the maximum height of the page.

       -width inches
	      Specifies	the maximum width of the page.

       -left inches
	      Specifies	the left margin	in inches.  Fractions are allowed.  By
	      default the window is centered in	the page.

       -top inches
	      Specifies	the top	margin for the picture in  inches.   Fractions
	      are allowed.

       -header string
	      Specifies	a header string	to be printed above the	window.

       -trailer	string
	      Specifies	a trailer string to be printed below the window.

       -landscape
	      Forces  the  window  to printed in landscape mode.  By default a
	      window is	printed	such that its longest side  follows  the  long
	      side of the paper.

       -plane number
	      Specifies	which bit plane	to use in an image.  The default is to
	      use the entire image and map values into black and  white	 based
	      on color intensities.

       -gray  2	| 3 | 4
	      Uses  a simple 2x2, 3x3, or 4x4 gray scale conversion on a color
	      image, rather than mapping to strictly black  and	 white.	  This
	      doubles,	triples,  or quadruples	the effective width and	height
	      of the image.

       -portrait
	      Forces the window	to be printed in portrait mode.	 By default  a
	      window  is  printed  such	that its longest side follows the long
	      side of the paper.

       -rv    Forces the window	to be printed in reverse video.

       -compact
	      Uses simple run-length encoding for  compact  representation  of
	      windows with lots	of white pixels.

       -output filename
	      Specifies	an output file name.  If this option is	not specified,
	      standard output is used.

       -append filename
	      Specifies	a filename previously produced by  xpr	to  which  the
	      window is	to be appended.

       -noff  When  specified in conjunction with -append, the window will ap-
	      pear on the same page as the previous window.

       -split n
	      This option allows the user  to  split  a	 window	 onto  several
	      pages.   This  might  be	necessary  for very large windows that
	      would otherwise cause the	printer	to overload and	print the page
	      in an obscure manner.

       -psfig Suppress	translation of the PostScript picture to the center of
	      the page.

       -density	dpi
	      Indicates	what dot-per-inch density should be  used  by  the  HP
	      printer.

       -cutoff level
	      Changes  the  intensity  level where colors are mapped to	either
	      black or white for monochrome output on a	LaserJet printer.  The
	      level  is	expressed as percentage	of full	brightness.  Fractions
	      are allowed.

       -noposition
	      This option causes header, trailer, and image  positioning  com-
	      mand generation to be bypassed for LaserJet, PaintJet and	Paint-
	      Jet XL printers.

       -gamma correction
	      This changes the intensity of the	colors printed by PaintJet  XL
	      printer.	The  correction	is a floating point value in the range
	      0.00 to 3.00.  Consult the operator's manual  to	determine  the
	      correct value for	the specific printer.

       -render algorithm
	      This  allows  PaintJet  XL  printer to render the	image with the
	      best quality versus performance tradeoff.	  Consult  the	opera-
	      tor's manual to determine	which algorithms are available.

       -slide This  option  allows overhead transparencies to be printed using
	      the PaintJet and PaintJet	XL printers.

SEE ALSO
       xwd(1), xwud(1),	X(1)

LIMITATIONS
       The current version of xpr can generally	print out on the LN03  most  X
       windows	that  are not larger than two-thirds of	the screen.  For exam-
       ple, it will be able to print out a large Emacs	window,	 but  it  will
       usually	fail when trying to print out the entire screen.  The LN03 has
       memory limitations that can cause it to incorrectly print very large or
       complex windows.	 The two most common errors encountered	are ``band too
       complex'' and ``page memory exceeded.''	In the first  case,  a	window
       may  have  a  particular	 six  pixel row	that contains too many changes
       (from black to white to black).	This will cause	the  printer  to  drop
       part  of	 the  line  and	 possibly  parts of the	rest of	the page.  The
       printer will flash the number `1' on its	front panel when this  problem
       occurs.	 A  possible solution to this problem is to increase the scale
       of the picture, or to split the picture onto two	or  more  pages.   The
       second  problem,	 ``page	 memory	 exceeded,'' will occur	if the picture
       contains	too much black,	or if the picture contains complex  half-tones
       such  as	 the  background color of a display.  When this	problem	occurs
       the printer will	automatically split  the  picture  into	 two  or  more
       pages.	It  may	 flash	the number `5' on its from panel.  There is no
       easy solution to	this problem.  It will probably	be necessary to	either
       cut  and	 paste,	or to rework the application to	produce	a less complex
       picture.

       There are several limitations on	the LA100 support:  the	 picture  will
       always be printed in portrait mode, there is no scaling,	and the	aspect
       ratio will be slightly off.

       Support for PostScript output  currently	 cannot	 handle	 the  -append,
       -noff or	-split options.

       The  -compact  option is	only supported for PostScript output.  It com-
       presses white space but not black space,	so it is not  useful  for  re-
       verse-video windows.

       For color images, should	map directly to	PostScript image support.

HP PRINTERS
       If  no -density is specified on the command line	300 dots per inch will
       be assumed for ljet and 90 dots per inch	for pjet.   Allowable  density
       values  for a LaserJet printer are 300, 150, 100, and 75	dots per inch.
       Consult the operator's manual to	determine densities supported by other
       printers.

       If  no -scale is	specified the image will be expanded to	fit the	print-
       able page area.

       The default printable page area is 8x10.5 inches. Other paper sizes can
       be accommodated using the -height and -width options.

       Note  that  a  1024x768 image fits the default printable	area when pro-
       cessed at 100 dpi with scale=1, the same	image can also be printed  us-
       ing  300	 dpi  with  scale=3 but	will require considerably more data be
       transferred to the printer.

       xpr may be tailored for use with	monochrome PCL printers	other than the
       LaserJet.  To print on a	ThinkJet (HP2225A) xpr could be	invoked	as:

	   xpr -density	96 -width 6.667	filename

       or for black-and-white output to	a PaintJet:

	   xpr -density	180 filename

       The  monochrome	intensity  of a	pixel is computed as 0.30*R + 0.59*G +
       0.11*B.	If a pixel's computed intensity	is less	than the -cutoff level
       it  will	 print	as  white.   This maps light-on-dark display images to
       black-on-white hardcopy.	 The default cutoff intensity is 50%  of  full
       brightness.  Example: specifying	-cutoff	87.5 moves the white/black in-
       tensity point to	87.5% of full brightness.

       A LaserJet printer must be configured with sufficient memory to	handle
       the  image.   For a full	page at	300 dots per inch approximately	2MB of
       printer memory is required.

       Color images are	produced on the	PaintJet at 90	dots  per  inch.   The
       PaintJet	 is  limited  to  sixteen colors from its 330 color palette on
       each horizontal print line.  xpr	will issue a warning message  if  more
       than  sixteen  colors  are encountered on a line.  xpr will program the
       PaintJet	for the	first sixteen colors encountered on each line and  use
       the  nearest  matching programmed value for other colors	present	on the
       line.

       Specifying the -rv, reverse video, option for the PaintJet  will	 cause
       black  and white	to be interchanged on the output image.	 No other col-
       ors are changed.

       Multiplane images must be recorded by xwd in  ZPixmap  format.	Single
       plane (monochrome) images may be	in either XYPixmap or ZPixmap format.

       Some  PCL printers do not recognize image positioning commands.	Output
       for these printers will not be centered on  the	page  and  header  and
       trailer strings may not appear where expected.

       The  -gamma  and	 -render options are supported only on the PaintJet XL
       printers.

       The -slide option is not	supported for LaserJet printers.

       The -split option is not	supported for HP printers.

       The -gray option	is not supported for HP	or IBM printers.
       Copyright 1986, Marvin Solomon and the University of Wisconsin.
       Copyright 1988, Hewlett Packard Company.
       See X(1)	for a full statement of	rights and permissions.

AUTHORS
       Michael R. Gretzinger, MIT  Project  Athena,  Jose  Capo,  MIT  Project
       Athena  (PP3812	support), Marvin Solomon, University of	Wisconsin, Bob
       Scheifler, MIT, Angela Bock and E. Mike Durbin, Rich Inc.  (grayscale),
       Larry Rupp, HP (HP printer support).

X Version 11			   Release 6				XPR(1)

NAME | SYNOPSIS | DESCRIPTION | SEE ALSO | LIMITATIONS | HP PRINTERS | AUTHORS

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