# 71 What is aliasing?

## Description

This article is from the sci.fractals
FAQ, by Michael C. Taylor and Jean-Pierre Louvet with numerous
contributions by others.

# 71 What is aliasing?

In computer graphics circles, "aliasing" refers to the

phenomenon of a high frequency in a continuous signal masquerading as

a lower frequency in the sampled output of the continuous signal. This

is a consequence of the discrete sampling used by the computer.

Put another way, it is the appearance of "chuckiness" in an still

image. Because of the finite resolution of a computer screen, a single

pixel has an associate width, whereas in mathematics each point is

infintesimely small, with "no width". So a single pixel on the screen

actually visually represents an infinite number of mathematical

points, each of which may have a different correct visual

representation.

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