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From: kwok@calgary.UUCP
Newsgroups: comp.graphics,comp.sources.wanted
Subject: Re: Halftone Display for Sun 2
Message-ID: <808@vaxb.calgary.UUCP>
Date: Wed, 18-Feb-87 15:44:20 EST
Article-I.D.: vaxb.808
Posted: Wed Feb 18 15:44:20 1987
Date-Received: Sat, 21-Feb-87 16:08:29 EST
References: <186@ndmath.UUCP>
Organization: U. of Calgary, Calgary, Ab.
Lines: 24
Keywords: halftone, graphics, shaded, grey-scale, sun
Xref: watmath comp.graphics:302 comp.sources.wanted:594

In article <186@ndmath.UUCP>, milo@ndmath.UUCP (Greg Corson) writes:
> Would anybody out there happen to have a program that displays shaded halftone
> output on a Sun-2 workstation display?  My data file is of the following format
> 1. A single line of text specifying resolution (ie: 420,320) followed by a 
>    newline.
> 2. All the bytes of the image, in row order.  8 bits (256 grey levels) per
>    pixel.
> 
> I would like a program that would generate a halftone from this image and 
> display it on a Sun-2 monochrome display (1 bit).  The quality of the image is
> not important...I need it to preview images before spending all the time to
> send them to a postscript printer for high quality output.
> 

We have developed an algorithm for magnifying/reducing greyscale images
and display/print them in halftone, at any size that you desire.  The
current implementation is on an Apollo 3000.  The conversion time is
typically 3 minutes from an original at 256x256x8 to a target at 1280x1024x1.

Regards

Paul Kwok, Univ of Calgary

ph (403)220-3531