Re: [stella] interlace
Subject: Re: [stella] interlace|
From: Glenn Saunders <cybpunks@xxxxxxxxxxxxx>
Date: Wed, 21 Jun 2000 21:31:02 -0700
At 10:54 PM 6/21/2000 -0500, you wrote:
But sprite flicker is kinda the same thing. Example, that polo demo(I
don't remember the name). I can't find it(I don't remember if I have a
Conceptually, yes, it is the same thing. 30hz flicker in a venetian blind
sprite that alternates as Polo does is mimicking what NTSC interlace does,
but with double the scanlines, mind you.
However, note that the background is stable on the VCS at 60fps.
Really? I mean in interlaced mode, shouldn't it be doing the same as a tv
signal? I've use a character generator that had very obvious pixals, one
per line, and it does not appear to flicker.
It's a somewhat subjective thing. Note that movies are 24fps, but I
believe the projector shutter passes by the aperture twice per frame so you
get the illusion of 48fps, but most people are so used to movies they don't
notice the flicker. So for some people their persistence of vision makes
it hard for them to notice 30hz NTSC interlace flicker. It's much more
evident when you have a high contrast line, one with a light color taking
up the upper field and one with a dark color on the next field. If you
have a light color that is thick enough to go through both fields then you
won't notice so much that on every other frame, one of the two fields is
dark. But if you get your eye really close to the scanline, you'll see it.
Also note that character generators typically employ some sort of
antialiasing and most text fonts have curves on most letters depending on
the font. Even if it's a subtle bend or curve it can really help eliminate
the perception of interlace flicker.
Nope, your right, it doesn't work. Well, it doesn't hold the frame, it
scrolls quite abit...
It's because the VCR doesn't really know where the beginning and the ends
of the frame are. The game isn't delivering a regular signal.
Glenn Saunders - Producer - Cyberpunks Entertainment
Personal homepage: http://www.geocities.com/Hollywood/1698
Cyberpunks Entertainment: http://cyberpunks.uni.cc
Archives (includes files) at http://www.biglist.com/lists/stella/archives/
Unsub & more at http://www.biglist.com/lists/stella/
- [stella] interlace, (continued)
- Glenn Saunders - Wed, 21 Jun 2000 22:18:38 -0400 (EDT)
- Mark De Smet - Wed, 21 Jun 2000 22:57:23 -0400 (EDT)
- Glenn Saunders - Wed, 21 Jun 2000 23:33:15 -0400 (EDT)
- Mark De Smet - Wed, 21 Jun 2000 23:54:33 -0400 (EDT)
- Glenn Saunders - Thu, 22 Jun 2000 00:31:57 -0400 (EDT) <=
- Ben Combee - Thu, 22 Jun 2000 10:12:02 -0400 (EDT)
- Chris Wilkson - Thu, 22 Jun 2000 11:34:56 -0400 (EDT)
- Matthew W. Miller - Fri, 23 Jun 2000 15:14:16 -0400 (EDT)
- Chris Wilkson - Fri, 23 Jun 2000 17:59:31 -0400 (EDT)