On Thu, 22 Nov 2001, Christopher Phillips wrote:
> hmm.. except PAL of course will try to fix this, as it looks like
> drift, which will be happening in opposite directions on alternate
> scan lines. IIRC, and of course you will probably get no colour at
> all anyway.
I have the experience that PAL decoders (i.e. colour TV sets and monitors)
are very picky about the colour subcarrier frequency. Turning the
frequency adjustment knob by just a fraction of a degree can make the
colours totally disappear. I don't have so much experience in NTSC. My
NTSC VIC-20 board has a very flaky clock circuit; the picture waves
horizontally, and the computer crashes often when it is cold. Therefore I
seldom get colours from that board even via a real NTSC decoder.
> In case you hadn't guessed, IANAVideoEngineer :)
Me neither.
Another thing you can try for a rainbow effect is playing with a magnet.
On a black-and-white display, the effect is different: there the magnet
just "stretches" the picture but obviously does not distort colours. But
beware, the magnet can cause permanent damage. I never tried it with a
colour monitor.
Marko
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