I'm having a small problem understanding Alpha channels.  I thought that the 
Alpha Channel was the level of transparency but the following code does not 
seem to work.

$DI = 50;
$MOD = 127/$DI;
ImageAlphaBlending($im, true);
for ($x=0; $x<$DI; $x++) {
        $AL = 127-$MOD*$x;
        ImageFilledArc($im, $WD/2, $HT/2, $DI-$x, $DI-$x, 0, 360, $GLColor, 

The idea is to create a simple glare effect by taking a white circle and 
making it more transparent around the edges.  Though this only produces a 
white circle with fuzzy edges.  Can anyone tell me what I'm doing wrong and 
clue me in on this whole Alpha Channel Biz.


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