Hi Scott, the alpha channel referecne is from the RSR converter manual, see below: "What you do is the following: Take your file, pose it and render in a 600x600 window. Save your render as image: choose Macintosh PICT format (*.PCT). Open the file in Photoshop or the image-processor of your choice, invert the alpha-channel, resize the image to 91x91 pixels and save it. Extra tweaking is optional... Open the RSR-converter and convert your PCT to RSR, replacing the RSR that was part of the original Poser file."