1    Next open Bryce and create or select an object.  From this point on I will assume you know how to select or create objects, open the mat lab and selecting alpha channel by clicking the first bead beside "diffuse"

2    Clear out any beads that may be in the columns.  We are starting fresh from here. 

3    Click a bead in the first column to the right of "diffuse" to open the alpha channel.

4    Click the "P" in the texture editor then the second bead at the top of the editor window to open the texture source screen.