This task about Digital Signal Processing:

Find $10$ images from the internet that are: $8$ bit, $256$x$256$ gray level images.

Calculate and plot pmf for each separately.

Add the pixel values of $4$ of them and create a new image.

Plot the pmf of the total image.

Do the same for $8$ images.

Do the same for $10$ images.

Write code for this task in MATLAB.

Report your observations.

And explain it clearly.