There are a number of reasons for which an individual may choose to use Photoshop or [insert favoured photo editing software here] to edit or manipulate the photos from their camera, and its use is often subject to fierce debate and controversy.
National Geographic magazine have made their position on Photoshop clear, stating "We want to see the world through your eyes, not through photo editing tools... If you have digitally added or removed anything, please don't submit the shot" in their submission guidelines.
There have been numerous instances of prestigious photography competition winners seeing their pride turn to shame after being disqualified for use of Photoshop.
And finally, there have also been several instances of 'shopped images gaining widespread notoriety, and in some shocking cases, fraudulently presented as documentary evidence to illustrate news stories. Such cases include the "Reutersgate" photo editing scandal, the 2003 publishing of a manipulated photo of a scene in Basra which resulted in the sacking of photographer Brian Walksi, and more recently, Anhui province officials' laughable attempt to curry favour with their constituents with a disastrously bad Photoshopped image.
This phenomenon is nothing new - photo fakery predates image-editing software by some 130 years.
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