This function displays an image, automatically setting the colour map to grey if it is a 2D image, or leaving it as colour otherwise, and setting the axes to be equal . The image is also displayed as TrueSize , that is, pixels on the screen match pixels in the image. Finally a title corresponding to the image variable name is added.-This function displays an image, automatically setting the colour map to grey if it is a 2D image, or leaving it as colour otherwise, and setting the axes to be　equal . The image is also displayed as　TrueSize , that is, pixels on the screen match pixels in the image. Finally a title corresponding to the image variable name is added.