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;
$GLColor=ImageColorResolveAlpha($im,255,255,255,$AL);
ImageFilledArc($im, $WD/2, $HT/2, $DI-$x, $DI-$x, 0, 360, $GLColor,
4);
}
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.
-Jim
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