MatLab version image transform using LUT

function main()
    output_image = 'output.png';
    
    % Read image in grayscale
    image = imread('9tjxfk.jpg');
    if size(image, 3) == 3
        image = rgb2gray(image);
    end
    
    % Create lookup table
    table = uint8(0:255);
    table(1:100) = 0;
    table(101:200) = 100;
    table(201:254) = 200;
    table(255) = 255;

    % Apply LUT transformation
    transformed_image = lookup_table_transform(image, table);

    % Save output image
    imwrite(transformed_image, output_image);

    % Concatenate and display
    final_image = [image, transformed_image];
    imshow(final_image);
end

function result = lookup_table_transform(image, table)
    if numel(table) ~= 256
        error("Lookup table must have exactly 256 values");
    end
    
    % Apply lookup table transformation
    result = table(double(image) + 1);  % MATLAB indices start at 1
end
%%