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From: cunniff@hpesoc1.HP.COM (Ross Cunniff)
Newsgroups: comp.sys.amiga
Subject: 1080 monitor weirdness?
Message-ID: <4200002@hpesoc1.HP.COM>
Date: Fri, 16-Oct-87 18:27:43 EDT
Article-I.D.: hpesoc1.4200002
Posted: Fri Oct 16 18:27:43 1987
Date-Received: Sun, 18-Oct-87 09:50:34 EDT
Organization: Hewlett Packard, Cupertino
Lines: 31

While wasting time with my 1000 last night, I noticed an interesting effect:
if you create a high-contrast pattern of alternating colors, an interference/
shadowing/ghosting/whatever pattern appears.  Repeat by:

	Go into Deluxe Paint, 640x200 mode.
	Fill the screen with a pattern like (R = red, B = black)

	RBRBRBRBRBRBRB...
	RBRBRBRBRBRBRB...
	RBRBRBRBRBRBRB...
	RBRBRBRBRBRBRB...
	RBRBRBRBRBRBRB...
	.
	.
	.
	(you get the idea)

	The screen will now have a pattern of several intersecting
	curves of bright and dark areas.  At the very center of
	the screen, the brighter pixel groups will form a
	hexagonal packing pattern, which "spirals" outward toward
	the screen edges.

Any ideas on what causes this?  Is it an interference pattern caused
by the mask, or what?  Can anything be done about it (short of
buying a different monitor) - it IS rather pretty, but I wouldn't
want to look at it all the time.

				Ross Cunniff
				...{hplabs,ucbvax}!hpda!cunniff
				cunniff%hpda@hplabs.ARPA