问题描述

如何修改bitmap颜色属性为黑白

有人知道android如何修改bitmap的颜色属性为黑白吗？

解决方案

public static 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;
}