My pleasure, hopefully this answers your questions, but if not, I’ll check back to see if you ask a follow up question.
From the “Applications and Results” section towards the end of the paper:
“Figure 9 documents the energy consumption of the three images of Figure 8. Energy consumption is measured according to our energy model from Equation 1, using various grid sizes. The most prominent observation is the substantial energy savings achieved by colors chosen according to our continuous optimization approach. Across the different grid resolutions, we save on average 41 percentage of energy compared to using ColorBrewer colors.”