I am getting Error using * MTIMES (*) is not fully supported for integer classes. At least one argument must be scalar.

I have this code below and this error message appears

Error using *

MTIMES (*) is not fully supported for integer classes. At least one argument must be scalar.

Image1= imread('Coleen_Gray_in_Kansas_City_Confidential.jpg'); 
row=size(Image1,1);
Num=(randi(255,row));
En1=NumCod1*(Image1);

I tried using 'double ' but the values ​​in Image1 changed, I hope to help me solve this problem.

Image1= double(imread('Coleen_Gray_in_Kansas_City_Confidential.jpg'));