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BW-IMP(1)			    BRL-CAD			     BW-IMP(1)

NAME
       bw-imp -	convert	a black	and white bw image file	to imPRESS bitmap

SYNOPSIS
       bw-imp [-D] [-s squaresize] [-w width] [-n height] [-t thresh]
	      [-X page_xoff] [-Y page_yoff] [file]

DESCRIPTION
       Bw-imp converts an 8-bit	monochrome bw(5) format	file (read from	the
       standard	input if not specified)	to Imagen imPRESS language codes for
       plotting	a gray-scale image on a	300dpi Imagen laser printer.

       The gray	level is plotted on the	Imagen as a small pattern of dots, by
       default using "ordered dither", magnifying each input pixel into
       multiple	output pixels. The -D option causes the	gray levels to instead
       be plotted using	halftones, as in newspaper/magazine reproductions of
       photographs. The	-t option turns	off the	dithering, and uses the
       supplied	integer	value as a threshold value. Input pixels with
       magnitude >= thresh are output as white,	otherwise they are output as
       black. Each input pixel produces	exactly	one output pixel. If the input
       file is already bi-level, such as might be produced by the halftone(1)
       program,	then this is the option	to be used.

       Printing	is done	in portrait mode. The largest image which can
       generally be printed on an 8.5 by 11 inch piece of paper	is 2240	by
       3200 pixels, and	the default page offsets are calculated	for this size.
       For smaller images, such	as 512 squared,	-X750 and -Y1200 produce the
       image roughly centered on the page.

CAVEATS
       Bw-imp will take	several	CPU-minutes (on	a VAX 780) to convert a	single
       file.

EXAMPLES
       The following invocations are fairly typical:

	   pix-bw  -ntsc  image.pix  |	bw-imp	|   qpr	 -qi300	 &

	   rle-pix  image.rle  |  pix-bw  -ntsc	 |  bw-imp  |  qpr  -qi300  &

       The X and Y options in the bw-imp command below are to approximately
       center a	1024x1024 or 512x512 figure on a 8.5 by	11 inch	sheet of
       paper. As of release 4.0	the default margins on an output page
       resulting from a	bw-imp usage are smaller. This allows a	larger image
       to be printed on	one page.

	   rle-pix  image.rle  |  pix-bw  -ntsc	 |  bw-imp -X 200 -Y 800  |  ipr -L impress -q i300

       To threshold and	invert the black/white sense of	a pix file, use:

       bwmod -m	-8 -a 255 image.pix | pix-bw | bw-imp -t1 | ttcp -t -p35
       printhost

       To use the halftone package:

	   pix-bw  -ntsc  image.pix  |	halftone  |  bw-imp  |	 qpr  -qi300 &

SEE ALSO
       rle-pix(1), pix-bw(1), bw(5), pix(5)

DIAGNOSTICS
       Error messages are intended to be self-explanatory.

AUTHOR
       BRL-CAD Team

COPYRIGHT
       This software is	Copyright (c) 1989-2013	by the United States
       Government as represented by U.S. Army Research Laboratory.

BUG REPORTS
       Reports of bugs or problems should be submitted via electronic mail to
       <devs@brlcad.org>.

BRL-CAD				  07/08/2017			     BW-IMP(1)

NAME | SYNOPSIS | DESCRIPTION | CAVEATS | EXAMPLES | SEE ALSO | DIAGNOSTICS | AUTHOR | COPYRIGHT | BUG REPORTS

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