[求助] matlab新手求助点除问题

I = imread('C:\Users\Administrator\Desktop\Quickbird_all.jpg');
%图像的RGB
R=I(:,:,1);
G=I(:,:,2);
B=I(:,:,3);
epslon = 0.000001;
%求取B'分量B2
B2=B./(R+B+G+epslon);