Photographer David Byrne, who won the Take a View Landscape Photographer of the Year award last month and £10,000 prize money was stripped of his award when it was found that he added clouds to the winning photo in Photoshop. When asked about the photograph, Mr. Byrne said "‘I added clouds because the sky was a bit boring. Unfortunately, while I don’t feel like I have done anything wrong, I didn’t read the regulations and it does say that replacing the sky is not allowed." So before submitting a photograph into a photography contest, be sure you read all the rules carefully.
There is a reason we post this; Photoshop IS allowed in Michael's Annual contest, but there are other rules that need to be followed. A handful of photographers last year were disqualified in the later stages simply because they had already submitted their images (and won in many cases) other contests, or were professionals in their respective categories.
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The photo below shows a diagram a photographer used to show that Mr. Byrnes photo had been manipulated. The red lines point to two different points where the sun should be in the image if the shadows where correct.