图片亮度

//改变图片的亮度方法 0--原样 >0---调亮 <0---调暗private void changeLight(ImageView imageView, int brightness) {    ColorMatrix cMatrix = new ColorMatrix();    cMatrix.set(new float[] { 1, 0, 0, 0, brightness, 0, 1, 0, 0,            brightness,// 改变亮度            0, 0, 1, 0, brightness, 0, 0, 0, 1, 0 });    imageView.setColorFilter(new ColorMatrixColorFilter(cMatrix));}