Pictou NS lighthouse How blue is blue? How blue should a blue sky be. I was metering off the white siding and as a result I underexposed the sky. Is the sky really that blue? Perhaps not, but it makes for a powerful photo and shows off the white and red trim in the structure itself. That combined with Olympus colours gives a very pleasing result. The bottom has a less brilliant sky but I stopped this one down a bit to bring out the colour of the sky. The blue building in the foreground contrasts nicely with the textured sky, I think