s=cameraman;
cameraman loads a \(256 \times 256\) greyscale image of a cameraman.
The returned matrix s consists of integers between 0 and 255, which have been converted to double precision.
To display the image, use imagesc with a gray colormap:
imagesc(cameraman); colormap(gray); axis('image');
See ftp://nic.funet.fi/pub/graphics/misc/test-images/ or http://sipi.usc.edu/database/database.cgi?volume=misc.