For those of you using little-endian machines, (most of you: windows,
DECs [in 199Cory],...) we need to force fopen to read big-endian byte
order, so we pass it the option 'ieee-be':

fid = fopen('filename.int2','r','ieee-be');
imagematrixname = fread(fid,[256,256],'*uint16');
imagesc(imagematrixname);