anti-aliasing


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anti-aliasing

(graphics)
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.

anti-aliasing

(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.


Anti-aliasing
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.)


Anti-aliasing
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 ?
Unlike MSAA, CMAA's smoothing will also be applied to alpha-tested textures providing a more complete anti-aliasing of the frame.
SPECviewperf now provides the ability to compare performance of systems running in higher-quality graphics modes that use full-scene anti-aliasing.
An integrated low-pass, brickwall anti-aliasing filter that blocks out-of-band signals from aliasing down in-band.
With simultaneous support of high definition rendering (HDR) and anti-aliasing (AA)-functionality unique to ATI-the Radeon X1800 GTO is the ideal choice for those who want their games to look their best.
0 speeds production time by accelerating the on-screen rendering of 2D and 3D composites and delivering high fidelity support for blending modes, motion blur on 2D layers, anti-aliasing, track mattes and shadows.
The devices can also be used as an anti-aliasing filter for analog inputs of high-definition televisions (HDTV).