High Quality Content by WIKIPEDIA articles! Thomas Douglas Selkirk Duff (born December 8, 1952, named for his putative ancestor, the fifth Earl of Selkirk) is a computer programmer. He was born in Toronto, Ontario, Canada and grew up in Toronto and Leaside. In 1974 he graduated from the University of Waterloo with a B.Math and, two years later, got an M.Sc. from the University of Toronto.Duff worked at the New York Institute of Technology Computer Graphics Lab and the Mark Williams Company in Chicago before moving to Lucasfilm's Computer Research and Development Division. He and Thomas Porter, another Lucasfilm employee, developed a new approach to compositing images; their 1984 paper, "Compositing Digital Images", is "[t]he seminal work on an algebra for image compositing", according to Keith Packard. and "Porter-Duff compositing" is now a key technique in computer graphics. (See, for example, XRender and Glitz.)

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