alpha channel - significado y definición. Qué es alpha channel
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Qué (quién) es alpha channel - definición

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.

Cyclic nucleotide-gated channel alpha 3         
PROTEIN-CODING GENE IN THE SPECIES HOMO SAPIENS
CNGA3; Cyclic nucleotide gated channel alpha 3; CNGA3 (gene)
Cyclic nucleotide-gated cation channel alpha-3 is a protein that in humans is encoded by the CNGA3 gene.
Cyclic nucleotide-gated channel alpha 1         
PROTEIN-CODING GENE IN THE SPECIES HOMO SAPIENS
CNGA1; Cyclic nucleotide gated channel alpha 1; CNGA1 (gene)
Cyclic nucleotide-gated channel alpha 1, also known as CNGA1, is a human gene encoding an ion channel protein. Heterologously expressed CNGA1 can form a functional channel that is permeable to calcium.

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.

Ejemplos de uso de alpha channel
1. Addressing a news conference at the Onassis Cardiac Surgery Center a month after his transplant operation, Alpha Channel reporter Costas Gribilas said he had been «overwhelmed» by the gesture made by the parents of Doujon Zammit who died following a savage beating by bar staff on Myconos last month. «They are my second family,» Gribilas said of Zammit’s mother and father whom he met last Saturday when they visited Athens for a ceremony naming the intensive care unit of the Henry Dunant Hospital after their son who was transfered there after the Myconos beating.