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Term entries in the full glossary matching "alpha"

W3C Glossaries

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alpha

From Portable Network Graphics (PNG) Specification (Second Edition) (2003-11-10) | Glossary for this source

a value representing a pixel's degree of opacity. The more opaque a pixel, the more it hides the background against which the image is presented. Zero alpha represents a completely transparent pixel, maximum alpha represents a completely opaque pixel.
an implicit representation of transparent pixels. If every pixel with a specific colour or greyscale value is fully transparent and all other pixels are fully opaque, the alphachannel may be represented implicitly.
separating an alphachannel in which every pixel is fully opaque; all alpha values are the maximum value. The fact that all pixels are fully opaque is represented implicitly.
indexed table of alphasample values, which in an indexed-colour image defines the alpha sample values of the reference image. The alpha table has the same number of entries as the palette.
alpha compaction

From Portable Network Graphics (PNG) Specification (Second Edition) (2003-11-10) | Glossary for this source

an implicit representation of transparent pixels . If every pixel with a specific colour or greyscale value is fully transparent and all other pixels are fully opaque, the alpha channel may be represented implicitly.
alpha separation

From Portable Network Graphics (PNG) Specification (Second Edition) (2003-11-10) | Glossary for this source

separating an alpha channel in which every pixel is fully opaque; all alpha values are the maximum value. The fact that all pixels are fully opaque is represented implicitly.
alpha table

From Portable Network Graphics (PNG) Specification (Second Edition) (2003-11-10) | Glossary for this source

indexed table of alpha sample values, which in an indexed-colour image defines the alpha sample values of the reference image . The alpha table has the same number of entries as the palette .
The Glossary System has been built by Pierre Candela during an internship in W3C; it's now maintained by Dominique Hazael-Massieux

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