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0xAARRGGBBから0xAAと0xRRGGBBを取り出して、再び0xAARRGGBBにもどす。

Posted at 2012-02-15

var color:uint = 0xAARRGGBB;
var alpha:uint = color >>> 24;
var rgb:uint = color & 0xFFFFFF;
//alpha --;
color = alpha << 24 | rgb;