In photojournalism the ethics the taking photographs are a lot more strict then more other photographic pursuits. This is for the main reason that when images are seen in a News context; the viewer is expecting to see the truth. The slightest change in the photo can change the whole meaning of the photograph. The way the photo is taken angle, shutter, aperture, lighting or even to get the subject to something for a better picture.
Post capture changes such as Photoshop, can add that are needed or subtract from the “mistake” in the photo.
This is really evident in the TIME magazines depiction of O.J. Simpson, making his skin darker tapping into the fear in
http://www.biocrawler.com/w/images/9/95/OJ_Simpson_Newsweek_TIME.png
