Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!csd4.csd.uwm.edu!cs.utexas.edu!uunet!portal!cup.portal.com!thad
From: thad@cup.portal.com (Thad P Floryan)
Newsgroups: comp.sys.amiga
Subject: Re: Neptune Voyager Pix directly viewable on Amiga
Message-ID: <21784@cup.portal.com>
Date: 2 Sep 89 08:36:50 GMT
References: <21728@cup.portal.com>
Organization: The Portal System (TM)
Lines: 46

Some more tips re: processing the Stanford version of the Voyager pictures.

The original NASA pictures are 800x800x8 per frame.  The ones snarfed by the
people at Stanford from the NASA-JPL cable link are 640x480x8 (307,200 bytes).

DigiView (version 3.0) stores its "raw" RGB digitizations in 8 bitplanes for
each color.  A full RGB picture therefore has 24 bit planes' data.  This is
NOT anything akin to the Amiga IFF format.

These two facts (above) can be put to good use with the Stanford pictures!

By treating the Stanford pictures as either:

	1) 640x480x8 greyscale monoschrome, or
	2) the RED 640x480x8 bitplanes of a "raw" DigiView RGB picture

one can then easily view and manipulate the pictures directly.

For treatment (1) above, start DigiView (v 3.0), select INTERLACE ON, HIRES ON,
VERT OVERSCAN ON, HORIZ OVERSCAN OFF, COLOR OFF.  Be sure the Width=640 and
the Height=480, then click on "OK".  Bypass the requester stating No Video
Signal Present, then load your pictures using the LOAD menu from the DigiView
main pulldown menu.

For treatment (2) above, start DigiView (v 3.0), select INTERLACE ON, HIRES ON,
VERT OVERSCAN ON, HORIZ OVERSCAN OFF, COLOR ON.  Be sure the Width=640 and
the Height=480, then click on "OK".  Bypass the requester stating No Video
Signal Present, then load your pictures using the LOAD menu from the DigiView
main pulldown menu.

I've found that treatment (2) is best, but you have to endure the initial SLOW
startup of your picture in the RED mode.  After it's displayed, select the
COLOR menu, then push the slider for RED all the way up, and the sliders for
GREEN and BLUE all the way down (since there aren't any green or blue bitplanes
)
and select DISPLAY to (this time) get a very nice greyscale image in which all
the picture annotations are readable!  You cannot play with the bitplanes if
you initially started DigiView in the monochrome mode.

After adjusting brightness, contrast, saturation, sharpness, etc. to your
liking, you can either save the picture as (vastly reduced resolution) IFF
4-bitplanes, or you can print it.  The pictures come out great this way using
an Xerox 4020, and we're going to be experimenting (at HT Electronics) with
a Seiko and a Calcomp printer this weekend.

Thad Floryan [ thad@cup.portal.com (OR) ..!sun!portal!cup.portal.com!thad ]