anti aliasing ,what does it do

  iqs 20:14 24 Aug 08
Locked

Hi,
WIN XP,BFG 8800GT 512MB OC

Hi,
Can someone please explain what Anti Aliasing does to improve the quality of graphics within a game.

I am playing Outrun Coast to Coast,there is an option in the configuration settings to adjust the anti aliasing.Currently it is set to none,but has quality 1-7.

Any help is appreciated.
Thanks

  Sea Urchin 20:19 24 Aug 08

Have a read here

click here

  iqs 20:30 24 Aug 08

Hi Sea Urchin,From what I read(understood) from your link,anti aliasing improves the detail of an image.
I have selected Level 7,and noticed an improvement in the detail on the car and the foreground.
Thanks for the link

  Technotiger 20:33 24 Aug 08

It also smooths out jagged lines/edges - as on the Wings of air-craft in FSX etc.

  Gongoozler 20:42 24 Aug 08

Aliasing in video is the effect where an image with fine detail when sampled at a frequency near that of the detail produces another lower frequency. This is encountered in real life when you look from a moving vehicle through two railing fences such as alongside a pathway you see a pattern of dark and light zones. You also get the same effect when you listen to two musical instruments when one is slightly off tune and you hear a low frequency beat which is the difference between the two notes.
From the Wikipedia article, in digital signal processing, the original signal has the high frequency, or fine detail which is too fine to make a useful contribution but is near enough to the sampling frequency to produce spurious alias effects which would then blur the image. This is a paradoxical situation whereby reducing the resolution results in a better detailed image.

  Gongoozler 20:45 24 Aug 08

I missed out a crucial word from the above:

From the Wikipedia article, in digital signal processing, the original signal has the high frequency, or fine detail, which is too fine to make a useful contribution but is near enough to the sampling frequency to produce spurious alias effects which would then blur the image REMOVED.

Anyway I hope the posting helps rather than just confusing the issue.

  iqs 21:54 24 Aug 08

Hi Technotiger,thanks for the help.

Hi Gongoozler,thanks for the detailed explanation,it a lot clearer thanks.

Cheers all

  citadel 22:42 24 Aug 08

the more aa you add the more work your graphics card has to do, this slows frames per second

  iqs 10:45 25 Aug 08

Hi citadel,

The AA is on Level 7,and I have not noticed a slower frame rate,assuming It can be noticed by the naked eye.

It still looks and plays superb.

Thanks

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