For the correlation value extracted from the surface morphology GLCM matrix (Table ), we notice a dependency on three factors: pixel distance, power supply type, and deposition time. Correlation greatly decreases with pixel distance. For both the DC and HiPIMS power supplies the correlation increases with deposition time. An interesting aspect is the rate at which correlation increases, the correlation for the deposition done using the DC power supply starts at 0.033 for the distance of 1 pixel and after 15 minutes it ends at 0.085 while the correlation for the deposition done using the HiPIMS power supply starts at a greater value of 0.064 for the distance of 1 pixel and after 15 minutes it ends at 0.067. So even if the correlation parameter for the HiPIMS power supply starts at a greater value because the correlation for the DC power supply increases at a greater rate, it ends up being smaller than the correlation for the DC power supply.