Hi Anupam,
If you'd like to generate/create RGB values like for images, then it is quite straightforward.
Let's create 25 - by - 25 RGB image values with the uniform random generator or with already existing numerical values.
clearvars
R = randi([0, 1], 25);
G = randi([0, 1], 25);
B = randi([0, 1], 25);
RGB(:,:,1)=R;
RGB(:,:,2)=G;
RGB(:,:,3)=B;
imshow(RGB), shg
%% Or
clearvars
RGB(:,:,1)=randi([0,255], 25);
RGB(:,:,2)=randi([0,255], 25);
RGB(:,:,3)=randi([0,255], 25);
imshow(RGB), shg
Good luck
