Transform Bitmap to grayscale

GrayScale.java

public static Bitmap toGrayScale(Bitmap bmpOriginal) {

        int width, height;
        height = bmpOriginal.getHeight();
        width = bmpOriginal.getWidth();

        Bitmap bmpGrayscale = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888);
        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);
        bmpOriginal.recycle();
        return bmpGrayscale;
    }

@arifbd
It seems the original bitmap is quite large. Please check the width and height before you call the method Bitmap.createBitmap(...).