void printStatistics (ostream& os) const;
bool comparativeStatistics (const ImageFile& imComp, double& d, double& r, double& e) const;
bool printComparativeStatistics (const ImageFile& imComp, ostream& os) const;
void printStatistics (ostream& os) const;
bool comparativeStatistics (const ImageFile& imComp, double& d, double& r, double& e) const;
bool printComparativeStatistics (const ImageFile& imComp, ostream& os) const;