Manipulating photos is of all times. Back 1976 the Chinese removed the gang of four as you can see on the picture above. They were protected by Mao Zedong but after his death in 1976 quickly removed from the communist party and from a picture in 1976.
The manipulation of a photograph of four missiles being fired by Iran is of more recent. It ratcheted up the tensions between the Islamic state and the US and Israel. But now it appears that Tehran may have enhanced the pictures.
More innocent and clumsy photoshops mistakes can be seen on Cybernet News