It's just a picture of a tartan ribbon and may seem unremarkable, yet it marks a crucial moment in the development of colour photography and forms the basis of the photographs we take today.

BBC: Pioneering colour photography

"I'm always worried about the sitter -- are they cold, are they hot, are they comfortable -- and photography today is so accurate and so good that it is really so much easier just to take photographs and work from that, " he said.

CNN: Duchess of Cambridge's first official portrait unveiled

Jackson's famous shot became one of the country's favorite photographs of the 19th century and effectively introduced photography in the West.

CNN: Greatest photos of the American West

Sotheby's started selling photographs in 1971, and galleries devoted only to photography began to open in America, France and Germany.

ECONOMIST: Snapping up the past

Street photography was naturally a part of this, I could travel and see foreign places and by having my camera and taking photographs I could record what I found, and express what I felt about these places.

BBC: Students of the street