”Resolution varies from camera to camera, but ultimately images will be compared on similarly-sized screens or prints...
Higher-resolution sensors offer more detail, but their smaller pixel size often leads to higher noise levels, and consequently to lower dynamic range, tonal range, and color sensitivity...
Normalizing by pixel resolution makes it possible to compare actual sensor performance, similar to printing two images on the same printer.
For DxOMark Sensor Overall Score and Metrics, we chose a reference resolution equal to 8 Megapixels...“
”What should be remembered is that doubling the resolution adds:
3dB to the normalized SNR
0.5 bit to the normalized DR
0.5 bit to the normalized TR
1.5 bit to the normalized CS.
Also note that in DxO Labs’ Measurement Database, one can look either at normalized or absolute results, yet in the context of the DxOMark Sensor Overall Score, only normalized results are relevant. “