add to image matrix by including only adjacent pixels with intensity values between 900 and 1300 in matlab

main.m
% read the image into a matrix
img = imread('example.jpg');

% create a new matrix to hold the updated values
new_img = double(img);

% loop through each pixel in the image (except for the edges)
for i = 2:size(img,1)-1
    for j = 2:size(img,2)-1
        % get the intensity value of the current pixel
        intensity = img(i,j);
        
        % check if the intensity value is between 900 and 1300
        if intensity >= 900 && intensity <= 1300
            % check if the intensity values of adjacent pixels are also between 900 and 1300
            if img(i-1,j) >= 900 && img(i-1,j) <= 1300 && ...
               img(i+1,j) >= 900 && img(i+1,j) <= 1300 && ...
               img(i,j-1) >= 900 && img(i,j-1) <= 1300 && ...
               img(i,j+1) >= 900 && img(i,j+1) <= 1300
                   % average the intensity values of the current pixel and its adjacent pixels
                   new_img(i,j) = (img(i-1,j) + img(i+1,j) + img(i,j-1) + img(i,j+1) + intensity) / 5;
            end
        end
    end
end

% convert the matrix back to an image and display it
new_img = uint8(new_img);
imshow(new_img);
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