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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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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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Tch
Account closed
Registered: Sep 2004
Posts: 512 |
Quote: jackasser:we mean half hires pixel
This can´t be done,right?
It will always only be a delusion?
UIFLI is amazing,but there is no $D016 involved.
Just 2 different pictures interacting really fast. |
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T.M.R
Account closed
Registered: Dec 2001
Posts: 749 |
Quote: I think some examples of this Atari Mode were in the demo 'Numan' although i could be wrong. The display still does not look as good as IFLI on C64 though. The 80 pixel horizontal width would then give a virtual 160 h width after interlace and C64 could do virtual 320 width.
Still, The Atari probably has other tricks up its sleeve. Would like to see some graphic mode examples for this machine.
HIP is 160x192 yes, but with 16 lumas and interlace to mix them to 32, that's a pretty good image quality - the colour variants reduce the actual palette considerably, but add more interlaced shades.
As for other modes, the Atari can match the C64 for res in hi-res or multicolour but hasn't as good a colour depth (320x192 in two colours, 160x192 in up to five colours) unless sprites are used as underlays - the best mode to date is G2F, not quite C64 multicolour control of the colours but with access to a large proportion of the 128 colours. Some good examples here;
http://g2f.atari8.info/gallery.html |
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algorithm
Registered: May 2002
Posts: 705 |
Had a look at the pictures.. quiet good, but nowhere near as good as IFLI. and if you take into consideration other custom modes such as UFILI, XFLI, SHIFLI, Nowhere as good as C64 even though there might be more control in 'custom' colors on atari |
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