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Compositing. 1. Theory

机译:合成。 1.理论

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摘要

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.
机译:将像素的颜色与其不透明度相关联是简单,优雅且通用的合成功能的基础。但是,除了仅以这种方式存储像素外,还有更多原因。计算机图形学中最重要的抗锯齿工具之一来自对将像素存储到帧缓冲区的简单操作的概括。几个人同时发现了此操作的有用性,因此它有几个名称:消光,图像合成,alpha混合,叠加或拉伸。 Porter和Duff(1984)在先前的论文中将其最完整地编纂,他们将其称为over运算符。作者展示了一种导出over运算符的新方法,并描述了一些他认为有用的实现细节。

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