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Twynn
Account closed
Registered: Nov 2005
Posts: 9 |
Half pixel shifting
First of all: It's good to see that the C64-scene is still alive.
I kinda left the scene about ten years ago but after accidently crossing this site I got interested a bit again. Downloaded some demo's to see what happened since I left and I was quite amazed. Not those ugly 8x8 modes anymore, but good looking demos.
Anyway, when I was watching krestage I saw this intro for each demopart which used this high-resolution text which is said to use half pixel shifting? I'm still familiar with the normal vic-tricks, but this one made me curious.
Now I wonder how this is done. Is it just a visual trick or has the vic really some possibility to do half pixel movements or something? |
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pernod
Account closed
Registered: Nov 2004
Posts: 25 |
"Reticulate" by SCG was, as far as I know, the first 64 demo to use interlace effects. It was released in 1988. There is a scroller that utilizes the "half-pixel-shift" effect.
Reticulate
"Our pixels are smaller than yours"
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Dane
Registered: May 2002
Posts: 423 |
Check out the final part of Digital Magic: Digital Magic for an example of interlaced hires in many colours. Probably the smoothest interlace there is. |
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algorithm
Registered: May 2002
Posts: 705 |
Dane, that picture probably rates as one of the best I have seen, quality and resolution wise (Was it Kirsten Dunst btw?)
What mode was it in? |
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chatGPZ
Registered: Dec 2001
Posts: 11386 |
cruzer: in my book "half pixel interlace" just like "half pixel shift" implies displaying one halfpicture with an offset of half a pixel, which none of the tricks on the c64 can do. the thing you guys are talking about refers more to stroboskopic effect and persistance than interlace :) |
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Oswald
Registered: Apr 2002
Posts: 5094 |
groepaz: cant agree more, the term "half pixel shift" is bullshit
pernod, if you would have read the comments you would find an even earlier interlace demo from '86
Interlace |
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Dane
Registered: May 2002
Posts: 423 |
Thanks Algorithm. It is interlaced X-Fli and most definitely Kirsten Dunst. |
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Oswald
Registered: Apr 2002
Posts: 5094 |
somehow its funny to find out that whats thought to be a lame newschool craze (interlaced pix) was invented in the oldshcool era :)
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Tch
Account closed
Registered: Sep 2004
Posts: 512 |
Quote: somehow its funny to find out that whats thought to be a lame newschool craze (interlaced pix) was invented in the oldshcool era :)
I blame the screenshots. ;) |
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JackAsser
Registered: Jun 2002
Posts: 2014 |
Groepaz, oswald: When you scroll using $d016 one pixel back and forth in multicolor you move the image half a multicolor pixel, thus you get TRUE interlace. So, let fine-scroll be 0 and show every odd row and then let fine-scroll be 1 and show every even row (maybe I switched the fields now, which would look crap =) ). So, YES, in multicolor pixels you CAN move the image half pixels => TRUE interlace.
Although, normally interlace moves the picture half a pixel up and down (the TV does that automagically), but interlace works just as well moving sideways using $d016 (with 2x1 pixels!)
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Oswald
Registered: Apr 2002
Posts: 5094 |
jackasser:we mean half hires pixel |
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