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Info-Graphics Digest	Sun Aug 23 03:00:22 PDT 1987

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Today's Topics:

 DEC peripherals on HP workstations
 Stalking the wild HPGL.
 HPGL File Sharing
  HPGL File Snaring
  TIF/Painbrush format
 Creating color images

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Date: Sun, 16 Aug 87 12:26:15 edt
From: talton@grasp.cis.upenn.edu
Subject: DEC peripherals on HP workstations




As an application for an HP workstation at the University of Pennsylvania,
we hope to connect a 3-D display sytem for medical imaging (essentially
a 3-D frame buffer for CAT scan data).   We currently support DRV11
DMA communications for DEC VAX systems and hope that a compatible
communications interface is available for the HP bus.(Hewlett Packard).
Does anybody know if this is possible?  What we would need is a DMA board
that plugs into the HP, preferrably a DRV11 look-alike but not essential.
Any experience with interfacing HP workstations to DEC-compatible peripherals
would be appreciated. Please respond directly to talton@grasp.cis.upenn.edu
not to the net.

Thanks,

Dave Talton
Dynamic Digital Displays, Inc.
3508 Market St.
Philadelphia, PA  19104
(215) 386-8164

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Date:    Mon, 17 Aug 87 13:56:39 GMT
From: lamonts@Sdsc.Arpa
Subject: Stalking the wild HPGL.

Sorry 'bout that, chief, but I think you're going to have to write a little
assembly language program which installs itself as a device driver, perhaps
for COM2.  Unfortunately, the design of device driver is fairly messy thing
for COM2.  Unfortunately, the design of device driver is fairly messy thing
which would be too involved to explain here.  The best reference I've seen,
though there may be better, is the Microsoft Press book "Advanced MS-DOS" by
Ray Duncan.  There is a fairly lengthy chapter on the design of device drivers.

  Hope this helps.  If you have any questions, please Email me and I'll try to
give you what help I can.

                                                      spl
BITNET:    LAMONTS@SDSC
INTERNET:  LAMONTS@SDS.SDSC.EDU

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Date: Mon, 17 Aug 87 07:26 CET
From: "Matz Engstr\:m" <GUCME%SEGUC21.BITNET@wiscvm.wisc.edu>
Subject: HPGL File Sharing


I am responslible for a device independent plotting package with some
40 different graphical devices called PLAM on our IBM/MVS system.
I had the same idea as you about making any PC or workstationbased
software make its hardcopy in the HPGL language and have it on diskette
for later file transfer to the host. On the host I now have a program
REPLOT29 that disseminates this file and replots it on any of the
units on the host. REPLOT29 knows about 95% of the instructions of the
HPGL dialect used for a HP7475.

Our experience is that some packages like AutoCAD and Diagraph can
store their HPGL on disk. Most of these think, for later unattended
spool to the plotter.

If the PC package can't store it on diskette it's much worse. The only
solution we've seen yet is to put the PC back to back with another PC.
And have their RS 232 ports connected, and making the second one act
as plotter, and storing the data on diskette. It's expensive and not
very elegant. But a custommer of mine has done it successfully.

I am very curious to see if you get any smart tricks in DOS to do it.

Matz Engstr:m
Gothenburg Universities Computing Centre
S-400 12 Gothenburg
Sweden

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Date:     Fri, 21 Aug 87  07:55:09 MDT
From: ZSYJKAA%WYOCDC1.BITNET@wiscvm.wisc.edu (Jim Kirkpatrick 307 766-5303)
Subject:  HPGL File Snaring

I would like to thank all those who responded to my question last week
on capturing HPGL plot files on PCs.  I have accumulated the responses
and will gladly distribute the lot to anyone who sends me a request
(please include your address in the request, I still am not sure how to
read RFC822 headers after they've been re-routed 18 times).   The basic
conclusions are that HP's Gallery software cannot do this by itself.
The most frequent suggestion was the "daemon" approach, with several
suggested sources and in one case the entire program was included.
Another suggestion was to use the NCAR plot package and get to HPGL
from GKS' CGM file.

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Date:     Fri, 21 Aug 87  08:02:08 MDT
From: ZSYJKAA%WYOCDC1.BITNET@wiscvm.wisc.edu (Jim Kirkpatrick 307 766-5303)
Subject:  TIF/Painbrush format

As a follow-up to my question last week about capturing HPGL files from
HP's Gallery package, I was wondering if anyone could point me to a
description of TIF (Tag Image File) format and/or "PC Paintbrush" file
format.  Gallery can save a plot in either format, and they might be
alternatives to using HPGL to get to our color microfilmer.  My guess
is that the Paintbrush format is some sort of raster-based format, but
I hadn't heard of TIF before.  I suspect that handling Paintbrush files
will be useful on it's own, even ignoring Gallery.

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From: Milan DiPierro <milan%uvabme.bme.virginia.edu@relay.cs.net>
Subject: Creating color images
Date: 20 Aug 87 21:09:36 GMT

I am an undergraduate student at the University of Virginia.  I am looking
for information dealing with the display of color images.  More specifically
I am interested in converting black and white images into color.  Recently I
have read articles dealing with black and white movie colorization that touch
upon this subject.  Also there was a newspaper article in the New York Times 
describing the latest generation of copiers that willbe making full color 
spectrum copies.  

These articles were not very helpful in that they did not provide detailed
descriptions of the processes involved or of the software used.  Ideally, I 
would like to get a hold of some algorithms that deal with color display using
the RGB color gamut, the IHS gamut, or any other gamut.

Additionally any references to material that might prove helpfully would also
be appretiated. 


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