Aspect ratio
From wiki.gis.com
 |
This article does not cite any references or sources. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. (December 2007) |
For other uses, see Aspect ratio (disambiguation).
 |
Look up aspect ratio in Wiktionary, the free dictionary. |
The aspect ratio of a shape is the ratio of its longer dimension to its shorter dimension. It may be applied to two characteristic dimensions of a three-dimensional shape, such as the ratio of the longest and shortest axis, or for symmetrical objects that are described by just two measurements, such as the length and diameter of a rod. The aspect ratio of a torus is the ratio of the major axis R to the minor axis r.
Applications and uses
The term is most commonly used with reference to:
- graphic / image
- image aspect ratio
- computer display standard
- paper size
- standard photographic print sizes
- standard ad size
- pixel aspect ratio
- tire code
- tire sizing
- wing aspect ratio of an aircraft or bird
- Astigmatism of an optical lens
It is also a meme on ebaumsworld.com
Examples
From left to right:
- 1. = 4:3: Some (not all) computer monitors (VGA, XGA, etc), SDTV
- 1.414… = √2:1: Silver ratio, International paper sizes (ISO 216)
- 1.5 = 3:2: 35 mm film
- 1.618…: Golden ratio, close to 16:10 = 8:5: Widescreen computer monitors (WXGA, etc.)
- 1. = 5:3: Super 16 mm, a standard frame ratio among many European countries
- 1. = 16:9: HDTV
See also
- Ratio
- Equidimensional ratios in 3D
- Vertical orientation
