Compositing digital images

Thomas Porter, Tom Duff
1984 Computer graphics  
Most computer graphics pictures have been computed all at once, so that the rendering program takes care of all computations relating to the overlap of objects. There are several applications, however, where elements must be rendered separately, relying on eompositing techniques for the anti-aliased accumulation of the full image. This paper presents the case for four-channel pictures, demonstrating that a matte component can be computed similarly to the color channels. The paper discusses
more » ... lines for the generation of elements and the arithmetic for their arbitrary compositing. Permission to copy without fee all or part of this material is granted provided that the copies are not made or distributed for direct commercial advantage, the ACM copyright notice and the title of the publication and its date appear, and notice is given that copying is by permission of the Association for Computing Machinery. To copy otherwise, or to republish, requires a fee and/or specific permission. © 1984 ACM 0-89791-138-5/84/007/0253 $00.75
doi:10.1145/964965.808606 fatcat:aa4vlkpedbehtiauy74y4v7jcq