Ok I figured out another way to do it. It doesn't necessarily get the exact effect I wanted which was masking the top portion and gradually dwindling the mask up, but I got it to hide the bottom of the bar and I was able to move the bar up into full view with this change:
#pragma strict
var pBarImage : Texture2D;
var pBarOutline : Texture2D;
var power : float = 0.22;
function OnGUI () {
GUI.BeginGroup(Rect(Screen.width * 0, Screen.height * -0.004, Screen.width * 0.208 , Screen.height * 0.23 ));
GUI.Label(Rect(Screen.width * 0, Screen.height * 0.2 - power, Screen.width * 0.208, Screen.height * 0.24), pBarImage );
GUI.EndGroup();
GUI.Label(Rect(Screen.width * 0, Screen.height * -0.004, Screen.width * 0.208, Screen.height * 0.24), pBarOutline);
}
then I was able to increase the power variable which basically moved the bar up rather than previously where I wanted to just reveal the top of the bar gradually. Not the same effect but I definitely works without getting overly complicated!
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