alpha channels - meaning and definition. What is alpha channels
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What (who) is alpha channels - definition

OPERATION IN COMPUTER GRAPHICS
Alpha channel; Alpha blending; Alpha transparency; Alpha-blending; Alpha channels; Alpha composition; Porter-Duff; Alpha Blend; Alpha Blending; Alpha Channel; Premultiplied alpha; Matte channel; Alpha-channel; Alpha matte; Alphamap; Porter duff; Alpha Transparency; Alpha blend compositing
  • Alpha blending, not taking into account gamma correction.
  • Alpha blending, taking<br> into account gamma correction.

Alpha compositing         

In computer graphics, alpha compositing or alpha blending is the process of combining one image with a background to create the appearance of partial or full transparency. It is often useful to render picture elements (pixels) in separate passes or layers and then combine the resulting 2D images into a single, final image called the composite. Compositing is used extensively in film when combining computer-rendered image elements with live footage. Alpha blending is also used in 2D computer graphics to put rasterized foreground elements over a background.

In order to combine the picture elements of the images correctly, it is necessary to keep an associated matte for each element in addition to its color. This matte layer contains the coverage information—the shape of the geometry being drawn—making it possible to distinguish between parts of the image where something was drawn and parts that are empty.

Although the most basic operation of combining two images is to put one over the other, there are many operations, or blend modes, that are used.

Alpha (finance)         
RISK-ADJUSTED MEASURE OF THE SO-CALLED ACTIVE RETURN ON AN INVESTMENT
Excessive return; Excess return; Alpha coefficient; Alpha (Investment); Alpha risk; Alpha (investment); Trading alpha
Alpha is a measure of the active return on an investment, the performance of that investment compared with a suitable market index. An alpha of 1% means the investment's return on investment over a selected period of time was 1% better than the market during that same period; a negative alpha means the investment underperformed the market.
Alpha,alpha-trehalase         
CLASS OF ENZYMES
EC 3.2.1.28; Alpha,alpha-trehalose glucohydrolase
In enzymology, an alpha,alpha-trehalase () is an enzyme with system name alpha,alpha-trehalose glucohydrolase. This enzyme catalyzes the chemical reaction

Wikipedia

Alpha compositing

In computer graphics, alpha compositing or alpha blending is the process of combining one image with a background to create the appearance of partial or full transparency. It is often useful to render picture elements (pixels) in separate passes or layers and then combine the resulting 2D images into a single, final image called the composite. Compositing is used extensively in film when combining computer-rendered image elements with live footage. Alpha blending is also used in 2D computer graphics to put rasterized foreground elements over a background.

In order to combine the picture elements of the images correctly, it is necessary to keep an associated matte for each element in addition to its color. This matte layer contains the coverage information—the shape of the geometry being drawn—making it possible to distinguish between parts of the image where something was drawn and parts that are empty.

Although the most basic operation of combining two images is to put one over the other, there are many operations, or blend modes, that are used.