1984/01/01 by Thomas Porter, Tom Duff · 5 citations
Computer Science · Engineering · #Computer Graphics and Visualization Techniques #Advanced Vision and Imaging #Advanced Numerical Analysis Techniques
paper · doi:10.1145/800031.808606
openalex publication_date 1984/01/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/04
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 compositing 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 guidelines for the generation of elements and the arithmetic for their arbitrary compositing.