Power Law Transformation in Matlab

% These pics are just examples , you should choose a picture and put it to the same 

% folder that your matlab (.m) file also exists. After that you should only call it in the 

% imread function as shown in the code :

im=imread('SpaceElevator.jpg'); 

% RGB to gray 

I=rgb2gray(im); 

% In double format 

I=im2double(I); 

% computing size m,n 

[m n] = size(I); 

% Computing s = c * (r ^ gamma) where r and gamma are positive constants 

c = 2; 

g =[0.5 0.9 3 6];% Gamma Correction Array 

for p = 1 : m 

    for q = 1 : n 

        I3(p, q) = c * I(p, q).^ g(1); 

        I4(p, q) = c * I(p, q).^ g(2); 

        I5(p, q) = c * I(p, q).^ g(3); 

        I6(p, q) = c * I(p, q).^ g(4); 

    end 

end 

figure(3), imshow(I3);title('Power‐law transformation‐darkest');xlabel('Gamma='),xlabel(0.5); 

figure(4), imshow(I4);title('Power‐law transformation‐dark');xlabel('Gamma='),xlabel(0.9); 

figure(5), imshow(I5);title('Power‐law transformation‐light');xlabel('Gamma='),xlabel(3); 

figure(6), imshow(I6);title('Power‐law transformation‐lightest');xlabel('Gamma='),xlabel(6);