Main Page | See live article | Alphabetical index RGBA color space stands for Red Green Blue Alpha. The alpha channel is the transparency channel, and is unique to this color space. RGBA, like RGB, is an additive color space, so the more of a color you place, the lighter the picture gets. PNG is the best known image format that uses the RGBA color space. See also: Alpha compositing External Link Alpha transparency on W3C PNG specification This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.