Exactly. Photographic images have been manipulated from the very start. Take, for instance, Richard Jones Calvert's
Capuchin Friars (1846), where a person was bleached from the negative to enhance the composition.
But it is worth pointing out that photography has always had an uneasy relationship with manipulation. As a medium it lends itself to documentary/evidentiary practices, since it records images based on light reflecting from or shining through "what was actually there." This creates a certain expectation of realism on the part of the viewer, and that expectation affects their interpretation/reception/experience of the photograph. This understanding of photographic realism is why we tend to think of photographic evidence as more reliable than a sketch of a crime. I would argue that this belief in photographic realism carries over into the reception of photographic art as well -- I react differently to your (jnantz's) images because I believe that they are photographs. If I believed that they were water-colors or oil paintings I would have a different experience of them (even if they looked exactly identical). I "read" Roger Fenton's
The Valley of the Shadow of Death very differently after being given reason to believe that he (or his assistant) moved the canon balls around to create the final composition, but I would read it very differently still if I believed that those canon balls had been painted on the negative with ink and bleach. In one case we have a staged photograph -- but still a photograph. On the other we have a work of mixed media -- photography and illustration. Knowledge that an image has been manipulated undermines that belief in photographic realism, and creates a kind of cognitive dissonance on the part of those viewers that associate photography with realism. I think mtjade2007's name calling is a result of that kind of cognitive dissonance. If one is given something they think is documentary in nature and find that it has been heavily manipulated, one feels cheated, or lied to.
Now, the fact that many of us have such beliefs in photographic realism (a belief I would bet is less prevalent in folks born after the rise of photoshop, which led to heavy manipulation becoming more widespread) does not mean that those beliefs are justified. I think that the physical and chemical processes of analogue photography support those beliefs for those who have a reasonable grasp of how film photography works, but the "black box" nature of digital photography (where one cannot know what changes have been made between the image sensor and the file recorded by the camera) does not support it (though if you knew precisely how the file was recorded -- i.e. had a competent understanding of the firmware/software in question -- it would once again support it).
In the end, does any of this matter? I would argue that it does, since the belief in photographic realism enriches the interpretation of the photo (in fact, this was a central argument in my doctoral
dissertation -- read it at the risk of severe boredom!), even when it is a work of art and not primarily documentary in nature.
Incidentally, above I suggested Errol Morris' book, which is indeed quite good, but I think I was actually thinking of
Faking It, the book companion to the
Met Museum's exhibit by the same name. I think everyone in this thread would enjoy that book.