check if all inputs are positive in an image and convert to positive values if not in matlab

To check if all the pixels in an image are positive or not, we can use an if statement within a nested for loop to iterate through each pixel in the image. If a pixel has a negative value, we can convert it into a positive value by taking the absolute value of the pixel. Here's an example code:

main.m
% Read the image
img = imread('example.png');

% Get the size of the image
[rows, cols, channels] = size(img);

% Iterate through each pixel in the image
for row = 1:rows
    for col = 1:cols
        for channel = 1:channels
            % Check if the pixel value is negative
            if img(row, col, channel) < 0
                % Convert the pixel value to positive
                img(row, col, channel) = abs(img(row, col, channel));
            end
        end
    end
end

% Display the modified image
imshow(img);
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In this code, we first read the image using the imread function. We then use the size function to get the size of the image in terms of the number of pixels and channels. We then use a nested for loop to iterate through each pixel in the image. Within the loop, we use an if statement to check if the pixel value is negative. If it is, we convert it into a positive value using abs. Finally, we display the modified image using the imshow function.