NAME
avs2ps - convert AVS image input on stdin to monochrome PostScript on
stdout
SYNOPSIS
avs2ps [-b] [-dpi xxx] < infile.avs > outfile.ps
avs2ps converts a 24-bit color image file in AVS format into a dithered
monochrome PostScript image with the same number of pixels as the input
file. avs2ps may be used as a filter for the output of the render
program to produce a PostScript file directly.
avs2ps is machine independent, and does not impose restrictions on the
tile size in the original image. It supersedes the programs molras3d
and hdither in the viewtools package.
EXAMPLES
Produce an unbordered black & white image suitable for printing on a
300 dpi PostScript printer.
render < infile.r3d | avs2ps > image.ps
Add a border, and prepare image for a 400dpi printer
render < infile.r3d | avs2ps -b -dpi 400 > image.ps
OPTIONS
-b
Draw a border around the figure. By default avs2ps will produce a
borderless image 0.5 inch in from the bottom left of the page.
-dpi xxx
By default avs2ps writes header records into the PostScript output file
which are correct for a 300dpi printer (e.g. an HP IIIsi). If there is
a mis-match between the header records and the actual resolution of the
printer the image quality is substantially degraded. This option
allows one to specify a different printer resolution (e.g. -dpi 400 for
a Next printer, or -dpi 95 for GhostScript on a 1280x1024 workstation
screen).
DESCRIPTION
avs2ps converts the input stream to a grey scale image and then applies
an empirical algorithm for dithering and error propagation to produce a
monochrome output image.
SOURCE
anonymous ftp site:
ftp.bmsc.washington.edu
web URL:
http://www.bmsc.washington.edu/raster3d/raster3d.html
contact:
Ethan A Merritt
University of Washington, Seattle WA 98195
merritt@u.washington.edu
SEE ALSO
render(l), raster3d(l), avs
AUTHORS
Ethan A Merritt.
Dithering algorithm derived from code by Randy Read and Albert
Berghuis.