avs2ps is distributed as part of the Raster3D
molecular graphics package.
avs2ps converts an AVS image input on stdin to monochrome PostScript on stdout.
avs2ps [-b] [-dpi xxx] < infile.avs > outfile.ps
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. The code is machine independent, and does not impose
restrictions on the tile size in the original image. It supersedes less general
programs in the viewtools package.
avs2ps converts the input stream to a greyscale image and then applies an
empirical algorithm for contrast enhancement, dithering, and error diffusion to
produce a monochrome output image. The basic approach is a variant of
Floyd-Steinberg error diffusion.
Produce an unbordered black & white image suitable for printing on a 300
dpi PostScript printer:
render < description.r3d | avs2ps > image.ps
a border, and prepare image for a 400 dpi printer:
render < description.r3d | avs2ps -b -dpi 400 > image.ps
Ethan A Merritt. Dithering algorithm derived from code by Randy Read and Albert
- 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 300 dpi printer (e.g. an HP
Laserjet 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 Display PostScript on a 19'' 1280x1024
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