save/assign variables in parfor loop

Hello, Matlab experts.

I would like to do imaging processing with parfor iteration. Here is my simple example code. I wonder that how I can save/store variable resulting from the function in parfor loop. Thank you very much for your help in advance.

• *

a;   % 128x128 image

b;   % 128x128 image

result=zeros(128,128,2);

parfor row=1:128

       for column=1:128

           [plus,minus] = myfun(a(row, column), b(row,column));   
                  % myfun is "a-b" and "a+b", return two outputs

           result(row, column, 1)= plus;
           result(row, column, 2)= minus;  

        end
  end

figure; imagesc(result(:,:,1)); 
figure; imagesc(result(:,:,2));* *