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[[File:lighterstill.jpg]][[File:Optical-Distortion_Robert-DOISNEAU.jpg|right|frame]]

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A '''distortion''' is the alteration of the [[original]] shape (or other characteristic) of an object, [[image]], [[sound]], [[wave]]form or other form of [[information]] or representation. Distortion is usually unwanted. In some fields, distortion is desirable, such as [http://en.wikipedia.org/wiki/Electric_guitar electric guitar] (where distortion is often induced [[purposely]] with the amplifier or an electronic effect to achieve an aggressive sound where desired). The slight distortion of analog tapes and [http://en.wikipedia.org/wiki/Vacuum_tube vacuum tubes] is considered pleasing in certain situations. The addition of [[noise]] or other extraneous signals (hum, interference) is not considered to be distortion, though the effects of distortion are sometimes considered noise

A '''distortion''' is the alteration of the [[original]] shape (or other characteristic) of an object, [[image]], [[sound]], [[wave]]form or other form of [[information]] or representation. Distortion is usually unwanted. In some fields, distortion is desirable, such as [https://en.wikipedia.org/wiki/Electric_guitar electric guitar] (where distortion is often induced [[purposely]] with the amplifier or an electronic effect to achieve an aggressive sound where desired). The slight distortion of analog tapes and [https://en.wikipedia.org/wiki/Vacuum_tube vacuum tubes] is considered pleasing in certain situations. The addition of [[noise]] or other extraneous signals (hum, interference) is not considered to be distortion, though the effects of distortion are sometimes considered noise

==Optics==

==Optics==

In [[optics]], image distortion is a divergence from rectilinear projection caused by a change in magnification with increasing distance from the optical axis of an optical [[system]].

In [[optics]], image distortion is a divergence from rectilinear projection caused by a change in magnification with increasing distance from the optical axis of an optical [[system]].

<center>For lessons on the [[topic]] of '''''Distortion''''', follow [https://nordan.daynal.org/wiki/index.php?title=Category:Distortion '''''this link'''''].</center>

<center>For lessons on the [[topic]] of '''''Distortion''''', follow [https://nordan.daynal.org/wiki/index.php?title=Category:Distortion '''''this link'''''].</center>

==[http://en.wikipedia.org/wiki/Map_projection Map projections]==

==[https://en.wikipedia.org/wiki/Map_projection Map projections]==

In cartography, a distortion is the misrepresentation of the area or shape of a feature. The Mercator projection, for example, distorts Greenland because of its high latitude, in the sense that its shape and size are not the same as those on a globe.

In cartography, a distortion is the misrepresentation of the area or shape of a feature. The Mercator projection, for example, distorts Greenland because of its high latitude, in the sense that its shape and size are not the same as those on a globe.

==References==

==References==

This article incorporates public domain material from the General Services Administration document "[http://www.its.bldrdoc.gov/fs-1037/fs-1037c.htm Federal Standard 1037C]" (in support of MIL-STD-188).

This article incorporates public domain material from the General Services Administration document "[https://www.its.bldrdoc.gov/fs-1037/fs-1037c.htm Federal Standard 1037C]" (in support of MIL-STD-188).

[[Category: General Reference]]

[[Category: General Reference]]