Crooked Horizons in your Photos? - 5 Minute Digital Fix

Remember the good old photography days? Film camera in hand, you would see that perfect landscape, seascape or sunset and shoot off several shots. Perhaps a couple of weeks later, once you had returned home and finally finished that 24 or 36 exposure film, it was off to the photo-lab to get the film processed. You eagerly open the packet of photographs, looking for that superb seascape you took, knowing that it would almost certainly be taken up by National Geographic for their monthly magazine spread. What do you find? A not too bad photo, but the seascape horizon is crooked, here