Showing papers on "Alpha compositing published in 1988"
Book•
01 Dec 1988
TL;DR: The case for four-channel pictures is presented, demonstrating that a matte component can be computed similarly to the color channels, and guidelines for the generation of elements and the arithmetic for their arbitrary compositing are discussed.
Abstract: 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.
1,287 citations
01 Jun 1988
TL;DR: A system architecture for realtime display of shaded polygons that heavily leverages parallelism in several forms: pipeline, vector, and array processing, which is unique in providing efficient and balanced graphics that support interactive design and manipulation of solid models.
Abstract: This paper describes a system architecture for realtime display of shaded polygons. Performance of 100,000 lighted, 4-sided polygons per second is achieved. Vectors and points draw at the rate of 400,000 per second. High-speed pan and zoom, alpha blending, realtime video input, and antialiased lines are supported. The architecture heavily leverages parallelism in several forms: pipeline, vector, and array processing. It is unique in providing efficient and balanced graphics that support interactive design and manipulation of solid models. After an overview of algorithms and computational requirements, we describe the details of the implementation. Finally, the unique features enabled by the architecture are highlighted.
186 citations
Patent•
26 Sep 1988
TL;DR: In this article, a method for compositing a graphic image with a background image to produce translucent effects identifies a key signal for each portion of the graphic image, which is varied according to the amount of translucency desired for the graphics image from completely transparent to completely opaque.
Abstract: A method for compositing a graphic image with a background image to produce translucent effects identifies a key signal for each portion of the graphic image. The key signal is varied according to the amount of translucency desired for the graphics image from completely transparent to completely opaque. When the graphic image is mixed with the background image, the key signal is used to define the ratio of the graphic image to the background image at each part of the graphic image to produce a mixed image output.
115 citations