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A technique used on a grey-scale or colour bitmap display to make diagonal edges appear smoother by setting pixels near the edge to intermediate colours according to where the edge crosses them.

The most common example is black characters on a white background. Without anti-aliasing, diagonal edges appear jagged, like staircases, which may be noticeable on a low resolution display. If the display can show intermediate greys then anti-aliasing can be applied. A pixel will be black if it is completely within the black area, or white if it is completely outside the black area, or an intermediate shade of grey according to the proportions of it which overlap the black and white areas. The technique works similarly with other foreground and background colours.

"Aliasing" refers to the fact that many points (which would differ in the real image) are mapped or "aliased" to the same pixel (with a single value) in the digital representation.


(1) Smoothing the jagged appearance of diagonal lines in a bitmapped image. The pixels that surround the edges of the line are changed to varying shades of gray or color in order to blend the sharp edge into the background. This technique is also called "dithering," but is usually known as anti-aliasing when applied to diagonal and curved lines.

(2) Smoothing a distorted signal by applying various techniques that add data or filter out unwanted noise.

This teapot from the University of Utah was a famous first example of anti-aliasing applied to images. (Images courtesy of Computer Sciences Department, University of Utah.)

This teapot from the University of Utah was a famous first example of anti-aliasing applied to images. (Images courtesy of Computer Sciences Department, University of Utah.)
References in periodicals archive ?
ii) Performance increase derived by averaging the increase in performance of all the benchmarks named below on GeForce 7800 GTX and GeForce 7800 GTX 512 at 1600x1200 resolution, 4x antialiasing, 8x aniosotropic filtering on the following system configuration, AMD 2.
0, NVIDIA SLI technology, High Dynamic Range (HDR) lighting effects, NVIDIA PureVideo technology, advanced antialiasing algorithms, and much more.
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This translates to final render quality imagery in several seconds rather than several minutes, at full film quality, complete with antialiasing, motion blur, and all the usual rendering effects.
memory bandwidth, more than twice the bandwidth of the NVIDIA Quadro FX 2000, drives large texture performance and high-resolution, full-scene antialiasing.
By accelerating the antialiasing of points and lines, the Quadro FX 4500 delivers superior image quality in real-time without any decrease in performance.
Through these new methods, high-quality antialiasing is applied to entire scenes, not just to the edges of polygons.
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It also incorporates NVIDIA's powerful GeForce4 Titanium features including the nFiniteFX II engine that makes characters appear more lifelike; nView display technology for the ultimate flexibility in display options and control; and the Accuview Antialiasing subsystem for full-scene visual quality.
The new LabVIEW Digital Filter Design Toolkit, based on LabVIEW Express technology, provides a single software tool that engineers can use throughout the process to quickly and interactively design custom floating- or fixed-point filters for tasks such as noise reduction, signal extraction, antialiasing and resampling.
These new antialiasing modes deliver unrivaled performance and image quality in today's and tomorrow's games.
NVIDIA's Quadro4 500 Go GL GPU also delivers new and innovative features, including NVIDIA's PowerMizer power saving technology, Accuview Antialiasing and nView multi-display technologies.