说我有600×600的BitmapData，我想下来扩展到100×100。

Say I have a BitmapData of 600x600 and I want to scale it down to 100x100.

推荐答案

本作品：

var scale:Number = 0.32;
var matrix:Matrix = new Matrix();
matrix.scale(scale, scale);

var smallBMD:BitmapData = new BitmapData(bigBMD.width * scale, bigBMD.height * scale, true, 0x000000);
smallBMD.draw(bigBMD, matrix, null, null, null, true);

var bitmap:Bitmap = new Bitmap(smallBMD, PixelSnapping.NEVER, true);