Compositing. 1. Theory
Blinn, J.F.
California Inst. of Technol., Pasadena, CA;
This paper appears in: Computer Graphics and Applications, IEEE
Publication Date: Sep 1994
Volume: 14,
Issue: 5
On page(s): 83-87
ISSN: 0272-1716
References Cited: 2
CODEN: ICGADZ
INSPEC Accession Number: 4760115
Digital Object Identifier: 10.1109/38.310740
Current Version Published: 2002-08-06
Abstract
Associating a pixel's color with its opacity is the basis for a
compositing function that is simple, elegant, and general. However,
there are more reasons than mere prettiness to store pixels this way.
One of the most important anti-aliening tools in computer graphics comes
from a generalization of the simple act of storing a pixel into a frame
buffer. Several people simultaneously discovered the usefulness of this
operation, so it goes by several names: matting, image compositing,
alpha blending, overlaying, or lerping. It was most completely codified
in a previous paper by Porter and Duff (1984), where they call it the
over operator. The author shows a new way to derive the over operator
and describes some implementation details that he has found useful
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