Photojournalism was first seen when Photographer Henri Cartier-Bresson, in 1933 he saw a man jumping over a puddle, effectively it was created by the split second decision of a man to take a photo of something he saw.
Also Tony Vaccaro and Robert Capa are key names in the development of this specific type of photography. They are two of the well know photographers during The Second World War, they often took pictures during battles. Capa journeyed with soldiers so that he could capture moments that may later be known as major events
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Vaccaro on the other hand was actually a soldier himself, he captured the wreckage as he went along. Sadly his photos, or most of them, were destroyed because the army said that they showed the faces of soldiers who had died and this sort of image should not be shown to the world just yet.
During the Vietnam war Eddie Adams was another major participant in the future of photo journalism, he caught the execution of a enemy soldier just moments before his death. This image lead to a lot of controversy as it showed the unfair, un-trialed death of a human being. Admittedly it was the death of the enemy but none the less it was highly inhuman.
Context
Photographic Journalism is usually presented to us as the audience in Magazines and Newspapers. We consume this type of photography like mad as we have so many examples of each of those things. The type of photographic journalism shown to us varies from one to another, in a tabloid news paper they tend to try to find the funniest shot for the story that they could as most of the time they present funnier stories, or stories with a slightly comical edge. In papers such as the county times they use more serious and thought out shots to capture the situation as it is. Throughout time the ways in which we use this have changed and sorted themselves into groups as i have just explained.
Techniques
As i sort of explained above, the ways in which a photo is taken for this category varies around what type of audience it is aimed at. You either see photos which are taken at specifically comical moments or ones that are taken to show the surroundings or something important to a sad story.
The technology that is used for this has changed through the years and with this the type of photo and how it is taken has changed too. For example, we now have things such as burst cameras that capture multiple photos at once, so it has become easier to find a photo perfect for whatever we are trying to show. Also cameras have becomes able to take good clear images of actions and with shutter speed variations the photographer can capture a more appealing shot for the audience to see.