clear
clc

I = imread('cameraman.bmp');
imhist(I), axis([0 256 0 1800])

I2 = I;
numPixels = 0;
for i = 1 : 256
    for j = 1 : 256
        if (I2(i,j) == 14 || I2(i,j) == 13 || I2(i,j) == 9)
            I2(i,j) = 255;
            numPixels = numPixels + 1;
        end
    end
end
subplot(1,3,1), imshow(I,[0 255]), title('Original')
subplot(1,3,2), imhist(I), axis([0 256 0 1800]), title('Histogram')
subplot(1,3,3), imshow(I2,[0 255]), title('Transformed')