Dynamic range

Ratio between the largest and smallest values that a certain quantity can assume

Dynamic range is the ratio between the largest and smallest values that a certain quantity can assume. It is often used in the context of signals, like sound and light. It is measured either as a ratio or as a base-10 (decibel) or base-2 logarithmic value of the ratio between the largest and smallest signal values.

This keyword could refer to multiple things. Here are some suggestions: