http://www.jmonkeyengine.com/wiki/doku.php?id=alphastate says
An images alpha channel defines the parts of an image that are either visible (no alpha) or invisible (full alpha).
I interpret this as Alpha = 0x0 = fully solid, and 0xFF = fully transparent
However, experimentally, i see that its reversed: A=0xFF produces solid, and 0x0 transparent. :?