Multiply Mat and Scalar not working...help me

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I coding by android studio using opencv.

I tried mutiply scalar with Mat but not working.

Mat A = new Mat();
Mat B = new Mat();
Mat C = new Mat();
Mat D = new Mat();
Scalar alpha = new Scalar(5);

I take this:

and i multiply C with "alpha":

Core.multiply(C,alpha,D);

i wana D become :

but D become :

please help me..