what is perspective

[george013]

Many discussions are dealing with the perspective. There're many statements how perspective changes or doesn't change when you do this or that. But there is no definition of that word. What do you mean with perspective. Maybe time for some efforts to define that idea?
I opened another thread about the Point of View.

George

[Shadowman]

Perspective in relation to the arts, architecture, and photography refers to the technique of displaying a scene or object on a two-dimensional surface so that it appears three-dimensional. I first learned of perspective (linear, aerial) when I took a drawing course, learned more later on through engineering courses, and the concept of perspective applies to photography as well. Change your search term to aerial or linear and you'll find more information on the topic. Point of view is a similar concept to linear perspective but relates to the viewers position on an imaginary plane in relation to an imaginary line of horizon.

[Shadowman]

This link within Cambridge mentions perspective.

https://www.cambridgeincolour.com/tu...ft-lenses1.htm

[george013]

John,

I've a quite strict idea of perspective myself. I just want to know how others think of that subject.
Perspective is the suggestion of a third dimension on a 2-dimesional plane. There're many ways to suggest that third dimension. One of them is the "use" of linear perspective. That is where most discussion deal with. And mostly with one-liners such as "perspective is place related".
The big question is what is that linear perspective, not a description but a definition.

George

[xpatUSA]

John,

I've a quite strict idea of perspective myself. I just want to know how others think of that subject.
Perspective is the suggestion of a third dimension on a 2-dimesional plane. There're many ways to suggest that third dimension. One of them is the "use" of linear perspective. That is where most discussion deal with. And mostly with one-liners such as "perspective is place related".

I hate one-liners, especially incomplete sentences. There's a guy on DPR Sigma forum that uses one-worders quite often

The big question is what is that linear perspective, not a description but a definition.

George

Anyway, George, you've probably seen this definition:

"Perspective (from the Latin: perspicere to see through) in the graphic arts is an approximate representation, on a flat surface (such as paper), of an image as it is seen by the eye."

Source: https://en.wikipedia.org/wiki/Perspe...28graphical%29

I found it so easily that I probably didn't understand your question . . . as can sometimes happen

[Steaphany]

Could the usage your grasping for be "Point of View" ?

Here are some Place based examples:

As in a bird's eye view, the perspective as seen from an elevated position looking down upon a scene

Or as a mouse eye's view, the perspective as seen from a low or on the ground position looking up at a scene

Contrasting modern SLRs where you hold the camera to your eye to view and frame the scene, many film era cameras offered Waist level view finders which offered a different perspective than eye level cameras.

In the technical sense, Perspective is a mathematical transformation of a N dimensional object onto a < N dimensional surface. Common interpretations of our experience of the world, as mentioned above and as it applied to most art and photography, is 3.

[JohnRostron]

In the technical sense, Perspective is a mathematical transformation of a N dimensional object onto a < N dimensional surface. Common interpretations of our experience of the world, as mentioned above and as it applied to most art and photography, is 3.

I would define perspective as the rate of change of magnification (of the image) with respect to distance (of the subject). A view taken with a short-focus lens would have a more rapid change of magnification with distance as compared with one taken with a long-focus lens.

John

[george013]

I would define perspective as the rate of change of magnification (of the image) with respect to distance (of the subject). A view taken with a short-focus lens would have a more rapid change of magnification with distance as compared with one taken with a long-focus lens.

John

That's exactly what I think. And it has some consequences.

George

[William W]

Many discussions are dealing with the perspective.
But there is no definition of that word.
Maybe time for some efforts to define that idea?

There are indeed many discussions on CiC in which the noun "Perspective" is used.

There is no one definition which can adequately be used to fulfill the needs of all those conversations.

A practical and logical approach is to take the time and effort and be clear in defining what is the intended meaning of the word "perspective" each time, when one writes 'perspective' in any conversation.

One thing is for certain: no matter how many or how few 'definitions' are accumulated in this conversation, the word "perspective" will be used time and again, to mean other things.

WW

[flashback]

I think the best answer here, is the number 42.
(oh...and thanks for all the fish.)

[george013]

There are indeed many discussions on CiC in which the noun "Perspective" is used.

There is no one definition which can adequately be used to fulfill the needs of all those conversations.

A practical and logical approach is to take the time and effort and be clear in defining what is the intended meaning of the word "perspective" each time, when one writes 'perspective' in any conversation.

One thing is for certain: no matter how many or how few 'definitions' are accumulated in this conversation, the word "perspective" will be used time and again, to mean other things.

WW

This is what I exactly wanted to avoid. Talking about perspectieve without defining it. What is it in a photo you call perspective. Again, meant is the linair perspective.

George

[george013]

Not much interest. One more try. The , linear, perspective is related to the angle of view and the distance.

George

[xpatUSA]

Not much interest. One more try. The , linear, perspective is related to the angle of view and the distance.

George

Not sure what George wants from us in order for us to show some interest.

But, yes George, the linear perspective is indeed related to the angle of view and the distance.

Found these on the 'net:

linear perspective - the appearance of things relative to one another as determined by their distance from the viewer

Definition and Meaning of [linear] Perspective

Perspective is a linear system of spatial alignment which creates an illusion of depth on a two-dimensional flat surface (or on a shallow three-dimensional surface such as a relief carving).

It replicates the optical effects of recession, by organizing space and depth from one point of view. Often called Linear Perspective (geometric, mathematical or optical perspective), this system is based on how the human eye sees the world: that is, (1) objects which are closer appear larger, while more distant objects appear smaller; (2) the size of an object's dimensions along the line of sight appear relatively shorter (foreshortened) than dimensions across the line of sight.

Examples:

http://thevirtualinstructor.com/onep...rspective.html

http://www.artyfactory.com/perspecti...ive_index.html

http://psych.hanover.edu/Krantz/art/linear.html
.

[William W]

Not much interest. One more try. The , linear, perspective is related to the angle of view and the distance. George

Not sure what George wants from us in order for us show some interest.

the linear perspective is indeed related to the angle of view and the distance.

I concur on both points.

WW

[george013]

Not sure what George wants from us in order for us to show some interest.

But, yes George, the linear perspective is indeed related to the angle of view and the distance.

Found these on the 'net:

linear perspective - the appearance of things relative to one another as determined by their distance from the viewer

Definition and Meaning of [linear] Perspective

Perspective is a linear system of spatial alignment which creates an illusion of depth on a two-dimensional flat surface (or on a shallow three-dimensional surface such as a relief carving).

It replicates the optical effects of recession, by organizing space and depth from one point of view. Often called Linear Perspective (geometric, mathematical or optical perspective), this system is based on how the human eye sees the world: that is, (1) objects which are closer appear larger, while more distant objects appear smaller; (2) the size of an object's dimensions along the line of sight appear relatively shorter (foreshortened) than dimensions across the line of sight.

Examples:

http://thevirtualinstructor.com/onep...rspective.html

http://www.artyfactory.com/perspecti...ive_index.html

http://psych.hanover.edu/Krantz/art/linear.html
.

Ted,

You surprise me. Where I didn't faint, I did now.
Ultra Wide-Angle distortion\compression question

George