Recent threads have debated whether photography is art, and in a current thread the subject came up about the ethical model for manipulation at all points in the process of making a photograph. That included the suggestion that changing a scene before taking a shot has just as many implications as it does at other stages. Camera configuration wasn't mentioned, but should be. As can be expected the question of the difference between adjustments such as brightness and contrast as opposed to cloning an object in or out of the photograph was raised.
This is a topic that I have strong opinions about, based on significant exploration of the topic as a philosophical object. My thoughts start with the idea that trying to capture "reality" is jousting with windmills. Never mind reality in a photograph, is there visualized reality in an un-photographed scene? Or do two individuals look at the same scene and each see their own, very separate, reality. If that is true, then photographing "reality" is impossible!
But even if we allow close approximations of reality to be considered, is any photograph the same as the scene? Definitely not! Garry Winogrand was emphatic that photographs should not be confused with reality:
They do not tell stories, they show you what something looks
like, through a camera. The minute you relate this thing
(indicating the photograph being examined) to what was
photographed, it's a lie. It's two dimensional, it's the
illusion of a literal description ...
-- Garry Winogrand
http://www.youtube.com/watch?v=YQhZcKzbM9sI see photography as no different than painting. It's just communications with visual symbols (much the same as how deaf people think). Different tools, each with different limitations. With that concept in mind every philosophy relating to painted art also applies to photographic art.
Here are a couple of concepts to grapple with in that light...
When Picasso was asked "What is art?", his reply was "What isn't?"
But go one more step with Picasso:
There is no abstract art, you must always start with something.
afterwards you can remove all traces of reality, but the object
will have left an indelible mark.
-- Picasso
http://youtube.com/watch?v=ANqi-LuH5j8I think that means there is no "abstract art" that should be described as more abstract than any other. None is reality, art is abstract. Every photograph is just as abstract as is every painting on a philosophical level.