Talk:Perspective distortion

message: Nice first paragraph, containing:
"... Perspective distortion is determined by the relative distances at which the image is captured and viewed, and is due to the angle of view of the image (as captured) being either wider or narrower than the angle of view at which the image is viewed, hence the apparent relative distances differing from what is expected ..."
That is, according to the definition of distortion, we are comparing input to a system, to output from a system, and in this case, the input is the photographer's viewpoint or perspective, and the output is the audience's viewpoint or perspective of the presentation image. 
BUT no one is following that criteria when subsequently exploring conditions where system perspective distortion may be observed, explained, and intentionally employed or avoided if desired.
An image captured with a wide angle lens is not distorted, it can't be, because it is only the system input.
It must be compared to the system output before assessing system distortion, if any.
It must be compared to the experience of the audience of the resulting presentation image, the system output, in order for there to be a discussion of system distortion, in this case, system perspective distortion.
If the audience positions themselves such that they see the presentation image from proportional distance resulting in an identical angle of view to the photographer's capture angle of view, then there is no distortion.
"... But wide angle lenses distort everything, especially close up ...", someone might say.
No, they do not.
If you get close enough to the resulting printed image, relative in distance that the photographer was from the subject, such that the photographer's angle of view and the print-viewer's angle of view are the same, then the audience will have the same experience of the subject, NO DISTORTION.  
Please edit subsequent sections from the first paragraph to ALWAYS consider the definition of system distortion as a comparison of input to output.
See also https://www.edmundoptics.com/resources/application-notes/imaging/distortion/ and http://www.parallelhomeaudio.net/TypesAudioDistortion.html which sadly do not grock that they are comparing input to output, duh.
http://www.encyclopedia.com/science-and-technology/computers-and-electrical-engineering/electrical-engineering/distortion DOES mention system input versus output, but cites no author or published source other than the Columbia Encyclopedia, below, I will edit it slightly to be non-system specific ( audio versus imaging ):
"... [ System ] Distortion ... [ is ] undesired change in [ information ] as it passes from the input to the output of some system or device ... [ and ] results in poor reproduction of [ the original information ] ...  ..." -- The Columbia Encyclopedia, 6th edition, The Columbia University Press
I will keep searching academic and research materials that are not readily published or accessible on the web.
But, c'mon, folks, stop thinking that something in reality that we can observe without a camera -- someone's nose looking way-big when we put our eye right up to it -- is "Perspective distortion ( photography )" -- we don't need no camera to see big noses up close, that is NOT distortion, that's reality.
Thank you, carry on -- Photographic Fallacy Hunter --2600:8806:2400:7E00:2CA4:94D1:6BC:80F1 (talk) 05:22, 25 June 2017 (UTC)
thread_title: STOP - We're forgetting viewing the presentation image as a necessary component of system perspective distortion

message: Wow, no talk in over 2.5 years.  This article could use better photo examples, esp. including something forward of the main subject and some more clearly identifiable background objects whose sizes can be easily noticed. A set of only 2 or 3 in more normal layout should be fine. Dicklyon 18:11, 9 December 2006 (UTC)
thread_title: Need better examples

message: The redirect Perspective Distortion, Source has been listed at redirects for discussion to determine whether its use and function meets the redirect guidelines. Readers of this page are welcome to comment on this redirect at  until a consensus is reached.  Shhhnotsoloud (talk) 14:44, 19 March 2023 (UTC)
thread_title:  "[[:Perspective Distortion, Source]]" listed at [[Wikipedia:Redirects for discussion|Redirects for discussion]]