设置为灰度图

设置为灰度图

public Bitmap toGrayscale(Bitmap bmpOriginal){
    int width, height;       
    height = bmpOriginal.getHeight();        
    width = bmpOriginal.getWidth();
    Bitmap bmpGrayscale = Bitmap.createBitmap(width, height, Bitmap.Config.RGB_565);
    Canvas c = new Canvas(bmpGrayscale);
    Paint paint = new Paint(); 
    ColorMatrix cm = new ColorMatrix();       
    cm.setSaturation(0); 
    ColorMatrixColorFilter f = new ColorMatrixColorFilter(cm);        
    paint.setColorFilter(f);       
    c.drawBitmap(bmpOriginal, 0, 0, paint); 
    return bmpGrayscale; 
}

来自为知笔记(Wiz)