Copyright  Pat Hanrahan Optical Printing From: “Special Optical Effects,” Zoran Perisic From: “Industrial Light and Magic,” Thomas Smith (p. 181)

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Presentation transcript:

Copyright  Pat Hanrahan Optical Printing From: “Special Optical Effects,” Zoran Perisic From: “Industrial Light and Magic,” Thomas Smith (p. 181)

Copyright  Pat Hanrahan Composing Two Elements Background ForegroundTraveling Matte Holdout Matte * *+ += =

Copyright  Pat Hanrahan “Pulling a Matte” - Matte Creation From digitized images o Blue-screen matting (Petro Vlahos) Separate blue background from foreground image o Video or chroma-keying Range of chromaticities marked transparent o Image processing Set of colors marked transparent, region growing... From computer generated images o Coverage o Transparency

Copyright  Pat Hanrahan Blue Screen

Copyright  Pat Hanrahan Porter-Duff Compositing Algebra C’ = F A C’ A +F B C’ B OpenGL blendfunction Specify src and dst F’s 0, 1, As, Ad, 1-As, 1-Ad, min(As,1-Ad), Cs, Cd, 1-Cs, 1-Cd,

Copyright  Pat Hanrahan Painting – how are each of these strokes done?