AlphaChannel
From polycount
Revision as of 11:00, 1 February 2015 by EricChadwick (Talk | contribs)
An optional channel of image date in a texture file that can be used as a Transparency map, Height map, specular map, etc.
The alpha channel is usually 8 bits per pixel (256 colors), though certain file formats support different bit depths.
See also ChannelPacking, MultiTexture.