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From: ImageAnalyst on 22 May 2010 17:10
From code I've posted before:

clc; % Clear the command window.
close all; % Close all figures (except those of imtool.)
imtool close all; % Close all imtool figures.
clear; % Erase all existing variables.
workspace; % Make sure the workspace panel is showing.
fontSize = 20;

% Change the current folder to the folder of this m-file.
% (The line of code below is from Brett Shoelson of The Mathworks.)
if(~isdeployed)
cd(fileparts(which(mfilename)));
end
% Read in standard MATLAB grayscale demo image.
grayImage = imread('cameraman.tif');
subplot(1, 2, 1);
imshow(grayImage, []);
title('Original Grayscale Image');
set(gcf, 'Position', get(0,'Screensize')); % Enlarge figure to full
screen.

% Just for fun, let's get its histogram.
[pixelCount grayLevels] = imhist(grayImage);
subplot(1, 2, 2);
bar(pixelCount); title('Histogram of original image');
xlim([0 grayLevels(end)]); % Scale x axis manually.
% Display to command window
for bin = 1:length(grayLevels)
fprintf(1, 'For gray level %d, the count = %d\n', ...
grayLevels(bin), pixelCount(bin));
end
msgbox('Done! Check out the command window.');
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