RGBA color space
From Free net encyclopedia
RGBA color space stands for Red Green Blue Alpha.
The alpha channel is the opacity channel. If a pixel has a value of 0% in its alpha channel, it is fully transparent, whereas a value of 100% in the alpha channel gives a fully opaque pixel. Values between 0% and 100% make it possible for pixels to show through a background like a glass (translucency) or retain their anti-aliasing no matter the background, effects not possible with simple binary (zero/full) transparency.
PNG is the best known image format that uses the RGBA color space.
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See also
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External link
- Alpha transparency on W3C PNG specification