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Oswald
Registered: Apr 2002
Posts: 5086 |
VIC and the odd/even fields
okay this is getting confusing for me now. in another thread on lemon64 groepaz says that the vic does always display the same field, but it doesnt matter if its odd or even, and it lights up both the odd/even lines.
some1 can tell me:
- does vic use odd or even or dontcare lines?
- what does the term field mean from the tv electronics viewpoint?
- how does the vic only light up the odd (forex.) lines on the tv screen, and a little bit from the other ones?
- are there really 2 modes in the tv electronics for odd / even fields
- why does computer graphics flicker a hell more lot while "normal" tv screens looks as steady as my ass?
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MagerValp
Registered: Dec 2001
Posts: 1074 |
There are no "every 2nd line". The gap between scanlines depends on the CRT's dot pitch:
JA: please don't bring up digital effects and bandwidth, he's confused enough as it is :)
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Graham
Account closed
Registered: Dec 2002
Posts: 990 |
@JackAsser:
"Of course every other field is shown 20ms after the other one, but the content it displays belongs to the same time frame when the camera snapped them."
This depends on the camera and effect machines. Some cameras do 50 fps where each field is taken in 20 ms steps, but most cameras do it in 25 fps ofcourse. Same for genloc stuff put ontop. I have seen 50 fps scrollers put on top of 25 movies on TV. |
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JackAsser
Registered: Jun 2002
Posts: 2014 |
@Graham: yeps of course, but in general... |
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ptoing
Registered: Sep 2005
Posts: 271 |
Now one question remains. Is this technical stuff really relevant for us with what the demoscene does. I for one part would say no. The C64 works like it works, TVs work like they work. Unless you do hardware hacking stuff stays like it is. Done. |
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chatGPZ
Registered: Dec 2001
Posts: 11360 |
never wrong to understand WHY thinks work as they work :) |
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ptoing
Registered: Sep 2005
Posts: 271 |
Well I agree with that, tho people are explaining the same stuff over and over again here. |
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Oswald
Registered: Apr 2002
Posts: 5086 |
Quote: Now one question remains. Is this technical stuff really relevant for us with what the demoscene does. I for one part would say no. The C64 works like it works, TVs work like they work. Unless you do hardware hacking stuff stays like it is. Done.
fully understanding the display we use to, be able to use it to maximum effect is kinda important isn't it? |
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Oswald
Registered: Apr 2002
Posts: 5086 |
okay, I think I understand it now.
other questions:
how comes that eventho there is an iron rastermask (= defined pixels?) on color tvs, you can still resize the picture in a fashion which loooks like fully analog? |
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chatGPZ
Registered: Dec 2001
Posts: 11360 |
Quote: okay, I think I understand it now.
other questions:
how comes that eventho there is an iron rastermask (= defined pixels?) on color tvs, you can still resize the picture in a fashion which loooks like fully analog?
read your question again, you already know the answer :=) |
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Oswald
Registered: Apr 2002
Posts: 5086 |
you mean the "looks like" part? |
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