On what is photoshopped and what is not photoshopped

This week, a chap what I know from the electric internets had a jolly nice photo of a rainbow over Weymouth Bay published in the local newspaper. Here it is:

As you can see, by the time it reached the paper's website, it had had the hell compressed out of it, and it looked a little worse for wear.

"Photoshop!" cried the miseries and armchair generals that inhabit the bottom half of the internet, "It's a fake!"

They are wrong. If it WERE shopped, here's what it would look like:

Pretty different, I'm sure you'll agree.

In your face, the bottom half of the internet.