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What is Anti-Aliasing

post #1 of 10
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Hey just want to know what Anti Aliasing is, ive heard it in games around the place, whats it do?
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post #2 of 10
its a filter that smooths out the jagged lines in games so its more crisp and clear but it requires alot of video card power on most newer games.
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post #3 of 10
In digital signal processing, anti-aliasing is the technique of minimizing the distortion artifacts known as aliasing when representing a high-resolution signal at a lower resolution. Anti-aliasing is used in digital photography, computer graphics, digital audio, and many other domains.

In the image domain, aliasing artifacts can appear as wavy lines or bands, or moiré patterns, or popping, strobing, or as unwanted sparkling; in the sound domain, as rough, dissonant, or spurious tones, or as noise.

Anti-aliasing means removing signal components that have a higher frequency than is able to be properly resolved by the recording (or sampling) device. This removal is done before (re-)sampling at a lower resolution. When sampling is performed without removing this part of the signal, it causes undesirable artifacts such as the black-and-white noise near the top of figure 1-a.

In signal acquisition and audio, anti-aliasing is often done using an analog anti-aliasing filter to remove the out-of-band component of the input signal prior to sampling with an analog-to-digital converter. In digital photography, optical anti-aliasing filters are made of birefringent materials, and smooth the signal in the spatial optical domain. The anti-aliasing filter essentially blurs the image slightly in order to reduce resolution to below the limit of the digital sensor (the larger the pixel pitch, the lower the achievable resolution at the sensor level).
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post #4 of 10
Look at the nvidia control panel . . .

http://www.rage3d.com/reviews/video/...sli/aacomp.php
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post #5 of 10
Basically takes away jagged edges, and there are certain levels of "smoothness"
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post #6 of 10
It essentialy makes the resolution bigger and then scales it

So if you play with a 1024x768 res with 2xAA it renders the game at 2048x1536 and then scales it to 1024x768. This essentially gets rid of the jaggys, however in some games the edges start to become slightly blurred.
    
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post #7 of 10
Quote:
Originally Posted by XJBluto View Post
In digital signal processing, anti-aliasing is the technique of minimizing the distortion artifacts known as aliasing when representing a high-resolution signal at a lower resolution. Anti-aliasing is used in digital photography, computer graphics, digital audio, and many other domains.

In the image domain, aliasing artifacts can appear as wavy lines or bands, or moiré patterns, or popping, strobing, or as unwanted sparkling; in the sound domain, as rough, dissonant, or spurious tones, or as noise.

Anti-aliasing means removing signal components that have a higher frequency than is able to be properly resolved by the recording (or sampling) device. This removal is done before (re-)sampling at a lower resolution. When sampling is performed without removing this part of the signal, it causes undesirable artifacts such as the black-and-white noise near the top of figure 1-a.

In signal acquisition and audio, anti-aliasing is often done using an analog anti-aliasing filter to remove the out-of-band component of the input signal prior to sampling with an analog-to-digital converter. In digital photography, optical anti-aliasing filters are made of birefringent materials, and smooth the signal in the spatial optical domain. The anti-aliasing filter essentially blurs the image slightly in order to reduce resolution to below the limit of the digital sensor (the larger the pixel pitch, the lower the achievable resolution at the sensor level).
Damn, I was JUST ABOUT to say that exact same thing ...
    
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post #8 of 10
It's the doppelganger of aliasing
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post #9 of 10
Quote:
Originally Posted by xdaseinx View Post
It's the doppelganger of aliasing
LMAO + Rep and to 3rd poster
post #10 of 10
Quote:
Originally Posted by G|F.E.A.D|Killa View Post
its a filter that smooths out the jagged lines in games so its more crisp and clear but it requires alot of video card power on most newer games.
those few words slapped Crysis right across my face

but yea i couldn't give you a professional definition, but its basically a filter of many filters that fine tunes the edges and gives them that smooth look. As everything is made of lines it can be hard to get a crisp look.

the best way to tell the difference is to hike up the AA in a game and then turn it to 0, youll know what im talking about.
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