Detected light has difference between lowest and highest intensity {contrast, vision}.
contrast control
Good contrast control sets black to zero intensity while decreasing or increasing maximum intensity. Consciousness cannot control contrast directly. Television Contrast control sets "black level" by shifting lowest intensity to shift intensity scale. It adjusts input signal to make zero intensity. If input is too low, lower input signals all result in zero intensity. If input is too high, lowest input signal results in greater than zero intensity. Television Contrast control changes all intensities by same amount and so really changes brightness.
Consciousness>Consciousness>Sense>Vision>Physiology>Intensity
1-Consciousness-Sense-Vision-Physiology-Intensity
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Date Modified: 2022.0224