solve two questions in Matllab

Write Pseudocodel Agorithm/Python-MALTAB code to detect whether an image is an RGB or a gray scale. (I Mark) What is the purpose of the following code. Here 'img' represents an image. Explain what values will be stored for each of these variables on the left-hand side. (2 marks) a=size(img,1) : b=size(iimg,2); result = ones (a,b)