Color con formato de textura alpha, 8 bits por canal.
Each of RGBA color channels is stored as an 8-bit value in [0..1] range. In memory, the channel data is ordered this way: A, R, G, B bytes one after another.
Note that RGBA32 format might be slightly more efficient as the data layout in memory more closely matches what the graphics APIs expect.
See Also: Texture2D, texture assets.