How to create a blank image in Matlab [closed]

Question

I need help with Matlab code to answer the question below:

In the spatial domain, apply Gaussian noise to a blank image (thereby creating a noise-only image). Show two image examples of medium and high levels of noise with an estimated variance (i.e. noise power) of 50 and 200.

Answer 1

If you want a 3-channel all-black RGB image:

myimage = zeros(h,w,3, 'uint8');

Replace h and w with your height and width, of course.

And you can use whatever datatype you like to work with.