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POSTER(1)		    General Commands Manual		     POSTER(1)

NAME
       poster -	Scale and tile a postscript image to print on multiple pages

SYNOPSIS
       poster <options>	infile

DESCRIPTION
       Poster  can be used to create a large poster by building	it from	multi-
       ple pages and/or	printing it on large media.  It	 expects  as  input  a
       generic	(encapsulated)	postscript file, normally printing on a	single
       page.  The output is again a postscript file, maybe containing multiple
       pages together building the poster.  The	output pages bear cutmarks and
       have slightly overlapping images	for easier assembling.	The input pic-
       ture will be scaled to obtain the desired size.

       The  program uses a brute-force method: it copies the entire input file
       for each	output page, hence the output file can be very	large.	 Since
       the  program  does  not really bother about the input file contents, it
       clearly works for both black-and-white and color	postscript.

       To control its operation, you need to specify either the	 size  of  the
       desired poster or a scale factor	for the	image:

       - Given the poster size,	it calculates the required number of sheets to
	 print on, and from that a scale factor	to fill	these sheets optimally
	 with the input	image.

       - Given	a  scale  factor, it derives the required number of pages from
	 the input image size, and positions the scaled	image centered on this
	 area.

       Its  input  file	 should	 best be a real	`Encapsulated Postscript' file
       (often denoted with the extension .eps or .epsf).  Such	files  can  be
       generated from about all	current	drawing	applications, and text proces-
       sors like Word, Interleaf and Framemaker.
       However poster tries to behave properly also on more  relaxed,  general
       postscript files	containing a single page definition.  Proper operation
       is obtained for instance	on pages generated by (La)TeX and (g)troff.

       The media to print on can be selected independently from	the input  im-
       age  size  and/or  the  poster  size.  Poster  will determine by	itself
       whether it is beneficial	to rotate the output image on the media.

       To preview the output results of	poster and/or to (re-)print individual
       output pages, you should	use a postscript previewer like	ghostview(1).

OPTIONS
       -v Be verbose. Tell about scaling, rotation and number of pages.
	  Default is silent operation.

       -f Ask  manual  media  feed on the plotting/printing device, instead of
	  using	its standard paper tray.
	  Default is adhering to the device settings.

       -i <box>
	  Specify the size of the input	image.
	  Default is reading the image size from the `%%BoundingBox'  specifi-
	  cation in the	input file header.

       -m <box>
	  Specify the desired media size to print on. See below	for <box>.
	  The  default	is set at compile time,	being A4 in the	standard pack-
	  age.

       -p <box>
	  Specify the poster size. See below for <box>.	 Since poster will au-
	  tonomously  choose  for rotation, always specify a `portrait'	poster
	  size (i.e. higher then wide).
	  If you don't give the	-s option, the default poster size is  identi-
	  cal to the media size.

       -s <number>
	  Specify  a  linear  scaling  factor to produce the poster.  Together
	  with the input image size and	optional margins, this induces an out-
	  put poster size. So don't specify both -s and	-p.
	  Default is deriving the scale	factor to fit a	given poster size.

       -c <box>	or -c <number>%
	  Specify  the	cut  margin. This is the distance between the cutmarks
	  and the paper	edge. If  the  output  is  really  tiled  on  multiple
	  sheets,  the cut marks indicate where	to cut the paper for assembly.
	  This margin must be big enough to  cover  the	 non-printable	margin
	  which	almost all printers have. For <box> see	below.
	  Default  is  5%.  Only  when	you specify identical poster and media
	  sizes, the default cut margin	becomes	0,  effectively	 removing  the
	  cutmarks.

       -w <box>	or -w <number>%
	  Specify a white margin around	the output image.
	  In  the `ideal' situation (when an input `eps' file specifies	an ex-
	  act BoundingBox in its header), the output image will	be scaled  ex-
	  actly	 to  the  edges	of the resulting poster	(minus cut margin). If
	  you desire a certain margin  to  remain  around  the	picture	 after
	  poster assembly, you can specify this	with `-w'.
	  (This	 option	 is  actually redundant, since you can obtain the same
	  result using -s or -i. However some  might  find  this  more	conve-
	  nient.)
	  Default is 0.

       -o <outputfile>
	  Specify the name of the file to write	the output into.
	  (Only	 added	for  those poor	people who cannot specify output redi-
	  rection from their command line due to a silly OS.)
	  Default is writing to	standard output.

       The <box> mentioned above is a specification of horizontal and vertical
       size.   Only  in	combination with the `-i' option, the program also un-
       derstands the offset specification in the <box>.
       In general:
	    <box> = [<multiplier>][<offset>]<unit>
       with multipier and offset being specified optionally.
	    <multiplier> = <number>*<number>
	    <offset> = +<number>,<number>
	    <unit> = <medianame> or <distancename>

       Many international media	names are recognised by	the program, in	 upper
       and  lower case,	and can	be shortened to	their first few	characters, as
       long as unique.	For instance `A0', `Let'.
       Distance	names are like `cm', `i', `ft'.

EXAMPLES
       The following command prints an A4 input	file on	8 A3 pages, forming an
       A0 poster:
		poster -v -iA4 -mA3 -pA0 infile	>outfile

       The  next  command  prints an eps input image on	a poster of 3x3	Letter
       pages:
		poster -v -mLet	-p3x3Let  image.eps > outfile

       The next	command	enlarges an eps	input image to print on	a  large-media
       A0 capable device, maintaining 2	inch margins:
		poster -v -mA0 -w2x2i image.eps	> outfile

       Enlarge a postscript image exactly 4 times, print on the	default	A4 me-
       dia, and	let poster determine the number	of pages required:
		poster -v -s4 image.eps	> outfile

       Scale a postscript image	to a poster of about 1 square meter,  printing
       on  `Legal'  media,  maintaining	 a 10% of `Legal' size as white	margin
       around the poster.
		poster -v -mLegal -p1x1m -w10% infile.ps >outfile

PROBLEMS & QUESTIONS
   I get a blurry image	and/or interference patterns
       If your input file contains -or consists	of- pixel images  (as  opposed
       to  just	 vector	data which is essentially resolution independent), you
       might have this problem.	 Such pixel images are normally	 made  to  fit
       well to standard	300 (or	600) dpi devices.  Scaling such	a picture with
       an uncarefully chosen factor, can easily	lead to	hazy edges and	inter-
       ference patterns	on the output.	The solution is	to provide poster with
       an exact	scaling	factor (with the -s option), chosen as an integer.  If
       integer	scaling	 is  unpractical for your purpose, choose a fractional
       number made from	a small	integer	denominator (2,	3, 4).

   Can I select	only a small part of a given input picture?
       Yes, for	this purpose you can define both the size (width  and  height)
       and  offset  (from  left	 and  bottom)  of a window on the input	image.
       Specify these numbers as	argument to a `-i' command line	option.
       One way to obtain such numbers is previewing the	 original  image  with
       ghostview,  and	observing  the coordinate numbers which	it continually
       displays.  These	numbers	are in postscript  units  (points),  named  by
       poster as just `p'.

   Poster doesn't seem to work properly, output	pages are empty
       The  major  cause  for poster not to work correctly, is giving it post-
       script files which  don't  conform  to  proper  'eps'  behaviour.   Try
       whether	your application (or printer driver) cannot generate real 'en-
       capsulated postscript'.

   If I	ask for	a 50x50cm poster, it always generates something	bigger
       Yes, probably. When specifying a	desired	output size with the `-p'  op-
       tion, poster first determines an	array of sheets	to cover such an area.
       Then it determines a scale factor for the picture to fill these	sheets
       upto  their  edge. As result your requested size	is used	as rough guess
       only.  If you want an exact output size,	 specify  the  scaling	factor
       yourself	with the `-s' option (and omit the `-p').

   I want to keep the white space around the poster as in my original
       Poster	will  as  default  use	the  input  image  bounding  box,  and
       scale/translate that to the edges of your poster.  If the program which
       generated  your	input file specifies an	exact and tight	%%BoundingBox,
       you will	indeed loose your white	margin.	 To keep the original  margin,
       specify a `-i' option with as argument the papersize on which the orig-
       inal document was formatted (such as `-iA4').  Alternatively specify  a
       smaller scale factor (with -s) or an explicit new margin	(with -w).

POSTER ASSEMBLY
       Our  preferred method for the assembly of a poster from multiple	sheets
       is as follows:

       - Arrange the sheets in the proper order	on a large  table  or  on  the
	 floor.

       - Remove	 from  all sheets, except from those in	the leftmost column or
	 bottom	row, their left	and bottom cutmargin.

       - In left-to-right and bottom-to-top order, glue	the  right  (and  top)
	 cutmargin and stick the right (and upper) neighbouring	page on	top of
	 that.

       - Turn the glued-together poster	face bottom, and put adhesive tape  on
	 the sheet edges (on the backside of the poster) for more strength.

       - Remove	the remaining cutmargin	around the poster.

DEVICE SETTINGS
       For  postscript	level-2	 capable printers/plotters, which is about all
       modern postscript devices today,	poster will send  device  settings  in
       its output file.	 This consists of a `setpagedevice' call, setting:

       - the media size.
	 This  is required for all printers I know to get correct behaviour on
	 different media/picture sizes.

       - duplexing off.
	 Some printers will otherwise perform double-side printing by default.
	 Clearly that is not what you want to print a poster.

       - manual	media feed.
	 This  is  given  only	when poster was	executed with the `-f' command
	 line option. This is a	convenient feature if you want to  print  your
	 job on	different media	than normally installed	in the paper tray, and
	 you are submitting your  job  through	a  multi-user  networking  and
	 spooling environment.

       These settings cause proper device behaviour, without the need to manu-
       ally interact with the printer settings,	 and  has  been	 here  locally
       tested to work on devices like the HP300XL and HP650C.

       The settings thus passed	in the postscript file,	will affect the	device
       for this	job only.

DSC CONFORMANCE
       Poster will generate its	own DSC	header and other DSC lines in the out-
       put  file,  according  the  `Document Structuring Conventions - version
       3.0', as	written	down in	the `Postscript	Language Reference Manual, 2nd
       ed.' from Adobe Systems Inc, Addison Wesley Publ	comp., 1990.

       It will copy any	`%%Document...'	line from the input file DSC header to
       its own header output. This is used here	 in  particular	 for  required
       nonresident fonts.

       However	the  copy(s)  of  the  input  file included in the output, are
       stripped	from all lines starting	with a `%', since they tend to disturb
       our `ghostview' previewer and take useless space	anyhow.

SEE ALSO
       ghostview(1)

CONTRIBUTED BY
       Jos van Eijndhoven (email: J.T.J.v.Eijndhoven@ele.tue.nl)
       Design Automation Section (http://www.ics.ele.tue.nl)
       Dept. of	Elec. Eng.
       Eindhoven Univ of Technology
       The Netherlands
       24 August, 1995

								     POSTER(1)

NAME | SYNOPSIS | DESCRIPTION | OPTIONS | EXAMPLES | PROBLEMS & QUESTIONS | POSTER ASSEMBLY | DEVICE SETTINGS | DSC CONFORMANCE | SEE ALSO | CONTRIBUTED BY

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