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From: richard@gryphon.CTS.COM (Richard Sexton)
Newsgroups: comp.sys.amiga
Subject: Re: Another A2000 Question (LP monitor smear?)
Message-ID: <1894@gryphon.CTS.COM>
Date: Tue, 13-Oct-87 17:08:06 EDT
Article-I.D.: gryphon.1894
Posted: Tue Oct 13 17:08:06 1987
Date-Received: Thu, 15-Oct-87 22:20:41 EDT
References: <177@tahoma.ARPA> <1767@dino.cpe.ulowell.edu> <1792@cadovax.UUCP>
Reply-To: richard@gryphon.CTS.COM (Richard Sexton)
Organization: Trailing Edge Technology, Redondo Beach, CA
Lines: 36
Keywords: LP, long-persistence, smearing?
Summary: Flicker wars

In article <1792@cadovax.UUCP> keithd@cadovax.UUCP (Keith Doyle) writes:
>In article <1767@dino.cpe.ulowell.edu> miner@dino.cpe.ulowell.edu (Rich Miner) writes:
>>Smear vs Flicker?  I say purchase a multi-sync monitor and wait a few months.
>
>But for those of you who bought your Amiga to do desktop video, the
>answer is not scan-doublers, or LP monitors, as they won't help when
>you videotape the output and run it on someone's TV.  For those people,
>the real answer is: Learn to Design Hi-Res Screens that Don't Flicker.
>
>Keith Doyle

Keith has a good point. The worst offenders for flickering are 1) Horizontal
lines, especially lines of 1 pixel thickness. These are nasty because in
an interlaced screen the line is only displayed in one of two frames, kind
of "now you see it, now you dont". I syspect this is the reason the top
border of Intuition windows went from single pixel lines to thicker lines
from 1.1 to 1.2. Lines of more than one pixel arn't as bad.

2) Colours - Flicker is also dependent on the colors used. A color scheme
where there is high contrast bewteen the two colors is going to flicker
worse than a scheme where the colors are closer together in contrast.

For example, a worst case flicker pattern has to be a bunch of single
pixel white lines against a black background. (In {320 || 640} x 400 mode)

Note that its only the CONTRAST that counts, not the COLOR value. For example
cyan and beige are very different in hue, but quite close in (?) luminous
output, and this combination (and others) does'nt seem to flicker much.

"Hope this helps"
-- 
Richard J. Sexton
INTERNET:     richard@gryphon.CTS.COM
UUCP:         {hplabs!hp-sdd, sdcsvax, ihnp4, nosc}!crash!gryphon!richard

"It's too dark to put the keys in my ignition..."