'Images have other effects that are different from words, particularly at affective, aesthetic and imaginative levels' (Walsh 2006, p. 29).
Based on the news 'The Power of the Photograph' by ABC Radio National, a Berlin-based documentary maker, Sonia Heizmann reported on a photo gallery she visited in Dubrovnik which was once heavily bombard during the war in the early 1990's. Until today, pictures of captured scenes live among the citizens reminding them of what they had once gone through.
A piece of a photograph is a memory captured forever.

(Source: Atlanta Photojournalism Seminar 2006)

(Source: Atlanta Photojournalism Seminar 2006)
(Source: Atlanta Photojournalism Seminar 2006)
Have you ever wonder why photograph is so valuable to people? It is a form of evident! What you see is what you believe. Photographs evoke emotions because compared to texts, the expressions ladden on the subject's face for instance, gives us the instant need to react. For example, incidents of post-crimes, photographs are needed to assist in investigations.
However, media always sensationalize a certain news by usage of photographs. For example, the former Malaysia's Health Minister, Dato' Seri Chua Soi Lek's scandal picture was everywhere to be found on the internet. With photographs at hand, everyone is entitled to be a 'news reporter'; a medium of transaction to the public. The same goes for explicit photographs releases of popular celebs scandal such as Edison Chen's and Kim Kardashian's. Pictures exposed are picked up by the media.
According to Lester (1999), photographs earned the trust of everyone as 'the impact of the visual image on a viewer comes directly from the belief that 'the camera never lies'. But, these devices (camera) are only ingenuous in the hands which guided them. Nowadays, photographs are used to manipulate the public's trust. This means, it has become an ethical issue among photojounalist.
Lester (1999) also said that 'photographers and editors learned early in photography's history that economic and political gains can be made by photographic manipulations because of a naive and trusting public. Example we can see in Malaysia is the never ending rumours on the murder of Mongolian model, Altantuya Shaaribuu with Malaysia's Prime Minister, Dato Seri Najib Razak. Manipulation of photograph was done on this picture below which caught the entire nation's attention:
Speculation of suspects were Photoshoped dining together (Source: Anthroblogia 2007)
Though it is downright uncredible and obviously fake, this photograph will somehow cause a stir of political unrest and doubting in the government's administration.
As Walsh (2006, p. 29) emphasized, 'in interpreting meanings from images, we don't need to 'decode the words' as with print, but we do need to be able to 'break the visual codes' in a different way'. This is why, certain photographs may appear to provoke viewers' feelings and certain ones do not as different people percieve what they see differently.
References:
Davies, A & Heizmann, S 2007, The power of the photograph, The Media Report, ABC Radio National, viewed 12 June 2009, http://www.abc.net.au/rn/mediareport/stories/2007/2051819.htm
Lester, PM 1999, Chapter six: picture manipulations, Photojournalism An Ethical Approach, viewed 12 June 2009, http://commfaculty.fullerton.edu/lester/writings/chapter6.html
Walsh, M 2006, 'Textual shift: examining the reading process with print, visual and multimodal texts', in Australian Journal of Language and Literacy, vol. 29, no. 1, pp. 24 - 37.