黑白照片的Android

Question

可能重复：
how to force a photo into black and white黑白照片的Android

我想存储黑白照片时，我从手机拍照的照片。

Answer 1

像这样的东西应该工作：

public Bitmap greyScaler(Bitmap b) {  
    Bitmap grayscaleBitmap = Bitmap.createBitmap(b.getWidth(), 
      b.getHeight(), Bitmap.Config.RGB_565); 
    Canvas c = new Canvas(grayscaleBitmap); 
    Paint p = new Paint(); 
    ColorMatrix cm = new ColorMatrix(); 
    cm.setSaturation(0); 
    ColorMatrixColorFilter filter = new ColorMatrixColorFilter(cm); 
    p.setColorFilter(filter); 
    c.drawBitmap(b, 0, 0, p); 
    return grayscaleBitmap; 
}