Around 5% of the population has some form of colour blindness. The people of Pingelap in the Pacific have an interesting variation in that they have a genetic variant that renders almost all people from the island totally colour blind, they see in black and white only.
So how does colour blindness affect our photography, well now you can upload one of your photos and find out. Your photo has to be a max of 100KB and 1000 pixels on the longest side. Once uploaded you can see how your photo looks to someone who has colour blindness.