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public static final Image scale (Image srcImage, int newW, int newH) {
    int srcW = srcImage.getWidth();
    int srcH = srcImage.getHeight();
    //先做水平方向上的伸缩变换
    Image tmp = Image.createImage(newW, srcH);
    Graphics g = tmp.getGraphics();


    for (int x = 0; x < newW; x++) {
        g.setClip(x, 0, 1, srcH);
        //按比例放缩
        g.drawImage(srcImage,x-x*srcW/newW,0,Graphics.LEFT | Graphics.TOP);

    }

    //再做垂直方向上的伸缩变换
    Image dst = Image.createImage(newW, newH);
    g = dst.getGraphics();


    for (int y = 0; y < newH; y++) {
        g.setClip(0, y, newW, 1);
        //按比例放缩
        g.drawImage(tmp,0,y-y*srcH/newH,Graphics.LEFT | Graphics.TOP);
    }

    return dst;       
}