How to remove periodic noise from image in frequency domain?

I am trying to remove perioding noise from an Image I in frequesncy domain.

I am looping through each channel to remove noise from it and to presirve the color information

I am converting the image using forier transform then appling the filter"NOT DONE YET" then returnning the image to it's original form

I am not sure how to filter out the noise automatically but I have an idea.

to get the max signal in the Magnitude and delete that but I am not sure how to implement that filter can any one help?

function Image = RemovePeriodicNoise(I)
    [r, c, n] = size(I);
   
    for i  = 1:n
        %mag of each channel
        C = I(:,:,i);
        F = fft2(C);
        Mag = abs(F).^2;
        Mag = mat2gray(log(Mag + 1));
        Mag = fftshift(Mag);
        
        % removing periodic noise
        filtered = F;% how to filter F to be without  noise
        
         %reversing the image
         I(:,:,i)=ifft2(filtered); 
    end
   Image = I; 
end