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Fractional photons
0.0 0.5 0.1 0.2
0.2 0.4 0.0 0.2
0.1 0.7 0.4 0.0
0.5 0.4 0.4 0.1
 
After merging adjacent pixels:
0.0 0.9 0.1 0.02
0.2 0.0 0.0 0.02
0.1 1.1 0.0 0.0
0.9 0.0 0.4 0.1

Rounded whole photons:
0 1 0 0
0 0 0 0
0 1 0 0
1 0 0 0