h = imagesc(C)
h = imagesc(x,y,C)
imagesc displays an image using the image command, but scales the image data before display to use the full colormap. See the description of image for details on functionality and options.
imagesc stores [min(min(C)) max(max(C))] in the UserData of the image object it creates.
image
(c) Copyright 1994 by The MathWorks, Inc.