Does the brightness darkness tell us something about conductivity ? Please provide some references. Book chapter on analyzing SEM Images could be much appreciated.
From the SEM image one can say how the surface morphology looks!
In your case, I would look at the surface morphology (the texture) to see surface particles, or islets (the darkness) are connected or separated. The more connected conductive layer or the big the islets, the more is the conductivity.
You may look for the SEM basics in "Scanning Electron Microscopy" , by V. Kazmiruk
More disorder leads to a lower condutivity, all other things being equal. Therefore a surface with a very disordered texture and with pores suggests a lower conductivity. But no quantification can be made based on this, it is just a suggestion.
Alain
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