Problem in converting to uint8()

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The function here takes image matrix and creates a 2w+1 X 2w+1 matrix to convolute over it and average the pixel value and hence create a blur image using averaging method.

% Function to blur any image by average method.
function output = blur(img,w)           
    
    [row,cols] = size(img);
    
    total = 0;
    freq = (2*w + 1)*(2*w + 1);
    
    temp_i = 1;
    temp_j = 1;
    
    output = [];
    
    for i = 1:1:row
        for j =1:1:cols
            total = 0;
            
            for temp_i = i-w:1:i+w
                for temp_j = j-w:1:j+w
                    if(temp_i >=1 & temp_i<=row & temp_j>=1 & temp_j<= cols)
                        total = total + img(temp_i,temp_j);
                        freq = freq+1;
                    end
                end
            end
            
            output(i,j) = total/freq;
        end
    end
    % output = uint8(output);
end 

The output works fine if for the current code, but if I un-comment the line to get uint8 output image, I get incorrect result. To be precise, I get a uniform matrix having same value as all its elements.