Hello, I am doing some image processing in which I have imported a video clip and extracted relevant frames. I want to take one of the images (which is in intensity values) and use mesh() or a similar function to create a 3D plot where x and y are the location of the pixels and the z axis is the intensity or pixel value. When I use the mesh() function, I just get a blank 3D plot and 'Warning: Matrix dimensions must agree, not rendering mesh.' What am I doing wrong? any help? Does the intensity spectrum need to be adjusted? How do I make the matrix dimensions 'agree'? Thanks very much for any help.