Photography author Ben Long has a thought-provoking article over at CreativePro in which he argues that “all photos are manipulated” and that “there is no such thing as absolute truth in photography”:
All images are Photoshopped. Or Lightroomed, or iPhoto’d, or dodged, burned, re-touched, cross-processed, developed with more or less agitation in the tank, at warmer or cooler temperatures, and so on and so forth. This has been true since the beginning of photography.
Understanding the representational nature of photography will help you take better pictures because you’ll better understand how to exploit the strengths and weaknesses of the medium.
But perhaps more importantly, it’s important to understand that all images are manipulated. Still photos are the dominant communication medium used for everything from entertainment to artistic expression, journalism to sales. Becoming a more informed, understanding viewer will make it easier to understand when and whether there’s any “truth” in the images put before you.