function maketiff(a,fname)
% MAKETIFF write a TIFF file
%  MAKETIFF(A,FILENAME) will autoscale the the matrix A to a 256 level 
%  grey colormap and write it to the file FILENAME in Tagged Image File
%  Format (TIFF).
%
%  Example:  maketiff(pic,'mypic.tif')

% Leif.Harcke@stanford.edu
% 2001 January 19


a = double(a);         % convert to double precision
a = a - min(min(a));   % normalize to values between 0 and 255
a = a/max(max(a))*255;
a = uint8(a);          % convert to bytes

% define a greyscale colormap with 256 values
tmp1 = linspace(0,1,256)';
cmap = [tmp1 tmp1 tmp1];

imwrite(a,cmap,fname,'tiff');