% ADJGAMMA - Adjusts image gamma.%% function g = adjgamma(im, g)%% Arguments:%            im     - image to be processed.%            g      - image gamma value.%                     Values in the range 0-1 enhance contrast of bright%                     regions, values > 1 enhance contrast in dark%                     regions. % Copyright (c) 2001 Peter Kovesi% School of Computer Science & Software Engineering% The University of Western Australia% http://www.csse.uwa.edu.au/% % Permission is hereby granted, free of charge, to any person obtaining a copy% of this software and associated documentation files (the "Software"), to deal% in the Software without restriction, subject to the following conditions:% % The above copyright notice and this permission notice shall be included in % all copies or substantial portions of the Software.%% The Software is provided "as is", without warranty of any kind.% July 2001function newim = adjgamma(im, g)    if g <= 0	error('Gamma value must be > 0');    end    if isa(im,'uint8');	newim = double(im);    else 	newim = im;    end    	    % rescale range 0-1    newim = newim-min(min(newim));    newim = newim./max(max(newim));        newim =  newim.^(1/g);   % Apply gamma function