how to change the color of an image in a 400x500 pixel rectangle in matlab

main.m
% Read the image from the file
img = imread('image.jpg');

% Define the rectangle area
x1 = 100;
y1 = 100;
x2 = 500;
y2 = 400;

% Extract the rectangle from the image
rectImg = img(y1:y2, x1:x2, :);

% Change the color of the rectangle
redVal = 255; % define the new value of red color
greenVal = 0; % define the new value of green color
blueVal = 0; % define the new value of blue color

% Get the size of the rectangle
[height, width, ~] = size(rectImg);

% Loop through each pixel in the rectangle and set the new color
for y = 1:height
    for x = 1:width
        rectImg(y, x, 1) = redVal; % set the new red value
        rectImg(y, x, 2) = greenVal; % set the new green value
        rectImg(y, x, 3) = blueVal; % set the new blue value
    end
end

% Put the modified rectangle back into the image
img(y1:y2, x1:x2, :) = rectImg;

% Show the resulting image
imshow(img);
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