Xref: utzoo comp.graphics:6920 rec.video:7544
Path: utzoo!attcan!utgpu!jarvis.csri.toronto.edu!mailrus!cornell!uw-beaver!ubc-cs!alberta!calgary!ctycal!ingoldsb
From: ingoldsb@ctycal.COM (Terry Ingoldsby)
Newsgroups: comp.graphics,rec.video
Subject: Re: HDTV and ATV Glossary (TN32)
Summary: Evils of Interlace
Keywords: 525/59.94, 625/50, NTSC, PAL, SECAM, Component, Composite,
Message-ID: <428@ctycal.UUCP>
Date: 15 Aug 89 18:54:32 GMT
References: <120919@sun.Eng.Sun.COM> <121076@sun.Eng.Sun.COM> <12027@ulysses.homer.nj.att.com>
Organization: The City of Calgary, Ab
Lines: 17

In article <12027@ulysses.homer.nj.att.com>, ggs@ulysses.homer.nj.att.com (Griff Smith) writes:
> I assume this is part of the attempt to get rid of interlace so the
> computer graphics folks can avoid motion artifacts.  I already have to
> put up with motion artifacts while watching film on television, why do
> I have to lose realistic motion on recorded television just so computer
> graphics can look better?  What is so evil about interlace?
> 
Interlace can be a real pain if you want to draw thin horizontal lines, or
diagonal lines that cause only a single pixel to be illuminated on a scan
line.  In these cases the refresh rate is only the frame rate (eg. 30 Hz),
not the field rate, and flicker becomes quite annoying.  You can
occasionally see this on poorly designed text overlaid during TV sports
programs.  The flicker can be very visible.
-- 
  Terry Ingoldsby                       ctycal!ingoldsb@calgary.UUCP
  Land Information Systems                           or
  The City of Calgary         ...{alberta,ubc-cs,utai}!calgary!ctycal!ingoldsb