Image Processing : Histogram Equalization using MATLAB code

% MORPHOLOGY
% histogram equalisation

filename= 'far.jpg'; % the filename to be read
im=imread(filename);
im=imresize(im,[256,256]);
im=rgb2gray(im);
figure(1);
subplot(1,2,1);
imshow(im);

subplot(1,2,2);
Imagesc(im);  % display
axis('square');
colormap('gray');
imhist(im);
im_histeq=histeq(im);
figure(2);
subplot(1,2,1);
imshow(im_histeq);  % display
%axis('square');
colormap('gray');

subplot(1,2,2);
imhist(im_histeq);

Original Image and Histogram : 

Equalized Image and Equalized Histogram :