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This article is about shapes. For the aspect ratio of images,
film and video, see Aspect ratio(image).The aspect ratio is the
ratio of the width of a shape to its height[1] when the width is
larger thanthe height, i.e. the shape is positioned as a
"landscape" rather than "portrait".The aspect ratio is expressed as
two numbers separated by a colon (x:y). A commonmisunderstanding is
that x and y represent actual length and height. This is false;
they actuallyrepresent the relation between width and height. As an
example, 8:5, 16:10 and 1.6:1 are thesame aspect ratio.It may be
applied to two characteristic dimensions of a three-dimensional
shape.Contents [hide]1 Applications and uses2 Examples2.1
Rectangles2.2 Ellipses3 Math and aspect ratio4 See also5
References
Applications and uses[edit]
The term is most commonly used with reference to:Graphic /
imageImage aspect ratioDisplay aspect ratio: the aspect ratio for
computer displays.Paper sizeStandard photographic print
sizesStandard ad sizePixel aspect ratioPhotolithography: the aspect
ratio of an etched, or deposited structure is the ratio of the
height ofits vertical side wall to its width.HARMST High Aspect
Ratios allow the construction of tall structures without slantTire
codeTire sizingwing aspect ratio of an aircraft or bird
Astigmatism of an optical lensNanorod
dimensionsExamples[edit]
Rectangles[edit]Main article: Aspect ratio (image)For a
rectangle, the aspect ratio denotes the ratio of length to width of
the rectangle. An aspectratio of 1:1 is a square.
Aspect ratio compare.svgFrom left to right:When comparing the
above illustration to the below text, please note that the above
x:y aspectratio values are shown as vertical orientation rectangles
to better demonstrate visual differences,whereas the aspect ratio
values of the text below are written as rotated horizontal
orientation
rectangles (e.g. compare 3:4 vertical orientation illustration
to 4:3 horizontal orientation text).4:3 = 1.3: Some (not all) 20th
century computer monitors (VGA, XGA, etc.),
standard-definitiontelevision2:1 = 1.414: International paper sizes
(ISO 216)3:2 = 1.5: 35mm still camera film, iPhone displays16:10 =
1.6 (not shown above): Commonly used widescreen computer
displays(WXGA):1 = 1.618: Golden ratio, close to 16:105:3 = 1.6:
Super 16 mm, a standard film gauge in many European countries
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16:9 = 1.7: Widescreen TVEllipses[edit]For an ellipse, the
aspect ratio denotes the ratio of the major axis to the minor
axis.An aspect ratio of 1:1 is a circle.Elps-slr.svgMath and aspect
ratio[edit]
Aspect ratios are mathematically expressed as x:y (pronounced
"x-to-y") and xy(pronounced "x-by-y"), with the latter particularly
used for pixel dimensions, such as 640480.Cinematographic aspect
ratios are usually denoted as a (rounded) decimal multiple of width
vsunit height, while photographic and videographic aspect ratios
are usually defined and denoted bywhole number ratios of width to
height. In digital images there is a subtle distinction between
theDisplay Aspect Ratio (the image as displayed) and the Storage
Aspect Ratio (the ratio of pixeldimensions); see Distinctions.See
also
