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DVIRLE(1)		    General Commands Manual		     DVIRLE(1)

       dvirle -	convert	dvi version 2 files, produced by TeX82,	to RLE images

       dvirle  [  -m  number ] [ -h ] [	-s ] [ -d number ] [ -x	xfilter	] [ -y
       yfilter ] infile.dvi

       Dvirle converts .dvi files produced by TeX(1) to	 RLE(5)	 format.   The
       basic process involves two passes.  In the first	pass, the .dvi file is
       converted into a	list of	characters.  The second	pass takes  this  list
       and  converts  it  to RLE.  The image is	filtered to produce gray-scale
       letters.	 300dpi	fonts are used,	producing an unfiltered	page  size  of
       approximately  2500x3500	 pixels.   The default is to average this by 5
       pixels in the X direction and 5 in the Y, producing  a  510x708	image.
       The filtering parameters	can be altered with the	-x and -y flags.

       The  -m number option is	used to	change the device magnification	(which
       is in addition to any magnification defined in the  TeX	source	file).
       Number  should be replaced by an	integer	which is 1000 times the	magni-
       fication	you want.  for example,	-m 1315	would produce output magnified
       to 131.5% of true size.	The default is no magnification	(1000).	 Note,
       however,	that a site will only support particular  magnifications.   If
       you  get	 error	messages  indicating that fonts	are missing when using
       this option, you	probably have picked an	unsupported magnification.

       The -h flag, when supplied, causes the image to be  converted  "on  its
       side" (rotated by 90 degrees).

       Normally	 the  first  pass  prints the page numbers from	the .dvi file.
       The -s flag suppresses these.

       The default maxdrift parameter is 2 pixels (1/100th of an inch);	the -d
       option  may  be	used to	alter this.  The maxdrift parameter determines
       just how	much font spacing is allowed to	influence character  position-
       ing.   The  default  value  2 allows a small amount of variation	within
       words without allowing any letters to become too	far out	of position.

       The output file contains	a number of separate RLE images	 concatenated,
       one  for	 each  page  in	 the  input.   These  can  be  separated  with
       rlesplit(1).  The output	images have a  single  image  channel  and  an
       identical  "alpha" channel.  For	compositing with a colored background,
       it will be necessary to use rleswap(1) to expand	it to  3  color	 chan-

       The  shell script topcrop will crop off the top 384 lines of the	output
       image (assuming the default LaTeX page size and dvirle filtering	param-
       eters), making it suitable for viewing on a (384x512) frame buffer.
	   topcrop <file.rle >cropfile.rle

       A  better  solution is to use something like the	following LaTeX	macros
       to set the page size so that, with the default filter  parameters,  the
       output images will be 510x384.
       \newcommand{\maxpage}{%%	Make page as large as possible
       \newcommand{\plainpage}{%% Page with space for headers

       \newcommand{\headingspage}{%% Page with headers
       \newcommand{\emptypage}{%% Page with no headers

       dvirle1	  first	pass
       dvirle2	  second pass

       rleflip(1), rlesplit(1),	rleswap(1), urt(1), RLE(5).

       The  original  (Versatec) version was written by	Janet Incerpi of Brown
       University.  Richard Furuta and Carl Binding of the University of Wash-
       ington  modified	 the programs for DVI version 2	files.	Chris Torek of
       the University of Maryland rewrote both passes in order	to  make  them
       run  at reasonable speeds.  Spencer W. Thomas of	the University of Utah
       converted it to produce RLE images as output.

       The -h option doesn't work properly.  Use rleflip(1) instead.

       Truncates pages wider than 2550 pixels (8.5 inches).

       Doesn't handle missing fonts gracefully.

       Should be a single program, instead of a	shell script and two programs.
       Doesn't	use  the usual RLE argument and	file name conventions.	Should
       output the TeX page numbers as picture comments.

1				 May 12, 1987			     DVIRLE(1)


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