clear all;

tire = imread('tire.tif');
tire_negative = 255 - tire;

imshow(tire);
title('Tire');
figure
imhist(tire);
title('Tire hist');
figure
imshow(tire_negative);
title('Tire negative');
figure
imhist(tire_negative);
title('Tire negative hist');

% power law transformation
gamma_05 = 0.5;
gamma_13 = 1.3;

figure
im_gamma_05 = im2double(tire).^gamma_05;
imshow(im_gamma_05);
title('Tire with Power-Law Transformation of 0.5');
figure
imhist(im_gamma_05);
title('Tire with Power-Law Transformation of 0.5 - Histogram');

figure
im_gamma_13 = im2double(tire).^gamma_13;
imshow(im2double(tire).^gamma_13);
title('Tire with Power-Law Transformation of 1.3');
figure
imhist(im_gamma_13);
title('Tire with Power-Law Transformation of 1.3 - Histogram');

% histogram equalization
equalized_im = histeq(tire);
figure
imshow(equalized_im);
title('Equalized Tire Image');
figure
imhist(equalized_im);
title('Equalzied Tire Image - Histogram');