The alpha value of pixels can be set in transparent bitmaps only (i.e., bitmaps created with the value true passed to the transparent parameter of the BitmapData constructor)
package{
import flash.display.*;
public class Main extends Sprite{
public function Main(){
var imgData:BitmapData = new BitmapData(20, 20, true, 0x330000FF);
trace(imgData.getPixel32(0, 0)); // Displays: 855638271
// (Alpha is 0x33)
}
}
}
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