Image Histogram

clear all;
close all;
%Image Histogram
%it is representation of the brightness
%distribution 
A=imread('kick1.jpg');
%To see the histogram convert rgb image
% to gray .
    Agray=rgb2gray(A);
    imhist(Agray);
    ylabel('Pixels');
%imhist function shows us in x axes the brightness
%and y axes the number of pixels which has that much
%brightness
   


%If you want to see the brightness of red blue and
%green channels you can separate them and apply same
%principle.

R=A(:,:,1);
G=A(:,:,2);
B=A(:,:,3);

figure(5);
    subplot(131) , imhist(R),  title('R'),ylabel('Pixels');;
    subplot(132) , imhist(G) , title('G'),ylabel('Pixels');;
    subplot(133) , imhist(B)  ,title('B'),ylabel('Pixels');;