What are "s-curves" when it comes to photography?

Question: What are "s-curves" when it comes to photography!?
Best Answer - Chosen by Asker:

In any composition, whether photograph, drawing or painting, a good layout is one in which the observer's eys are naturally and effortlessly led into and through each image!.

One way in which this is done is for the elements in the image to be arranged in such a way as to describe an curve, not too abrupt, not too "lazy!." A flowing stream, for example may be an obvious way to do this, or a natural pathway, described by trees and other objects!. This could also be done with man made set ups of objects in the composition!. The point being that the eye is encouraged to enter the image at a point and "led" through it in gentle, smooth motions!.

A literal "S" shape is one configuration, but it need not be so!. It could be a backward "S," or one laying on its side!. It does not even have to complet the two curves of the "S!." It could be a movement more like the letter "C," in any direction!.

This eye movement could be done with the arrangement of object in the image, with line, color or any way the artist can manage it!.Www@QuestionHome@Com

To me an 'S Curve' is something you achieve in Photoshop!. You open your image, Click on curves!. You then click on two spaces on the curves line, (Equal distances from the middle point)!. One point goes up a little and one point goes down!. So the line in your curves palette which runs from the lower left hand corner to the upper right hand corner is now more shaped like an "S" Curve!.
This gives your image a little extra contrast in the midtones and even makes the image appear sharper!.Www@QuestionHome@Com

I took a photography class last semester!. Our prof said pictures with an "S" curve are highly desireable!. Meaning, imagine a road that curves like an S!. So, find paths, or shapes that have that unique S curve!. I found it on some lightrail tracks downtown!. Some people found it on walking paths!. So, it doesn't have to be a line, but literally an object or illusion of the "S" curve!.
Hope this helps - not an expert!Www@QuestionHome@Com

While Vince is correct, an "s" curve is an old standard in the portraiture of women!. Check this link:
http://jzportraits!.home!.att!.net/chapter-!.!.!.Www@QuestionHome@Com

scoliosis!?Www@QuestionHome@Com