function convo(i, m)
image = imread(i);
masko = imread(m);
[imager, imagec] = size(image)
[maskr, maskc] = size(masko)
result = zeros(imager, imagec);

% flipping the mask
mask = zeros(maskr, maskc);

for i1 = 1:maskr
   for j1 = 1:maskc
      mask(i1, j1) = masko((maskr-i1+1), (maskc - j1+1)); 
   end
end


% convolution
 for i = 1:(imager - maskr + 1)
     for j = 1:(imagec - maskc + 1)

        A = image(i:(i+maskr-1), j:(j+maskc-1));

         s = sum(dot(A,mask));
        result(i,j) = s;
        
    end
 end

%result
 
 
 %CONTRAST
 [rows, cols] = size(result);
large = max(max(result))
small = min(min(result))
rangeOriginal = large - small;

for i = 1:(imager - maskr + 1)
    for j = 1:(imagec - maskc + 1)
        result(i,j) = result(i,j) / rangeOriginal * 255;
        
    end
end

%result

imwrite(result, 'convoOut.pgm', 'pgm');

end