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tonal range

n. ~ Photography · The number of shades between the lightest and darkest areas of an image.

Notes: 

Tonal range is often measured in stops, or factors or two. If the darkest part of a print reflects 3% of light and the brightest portion reflects 98%, the tonal range is approximately five stops (3, 6, 12, 24, 48, 96).

Even though the tonal range is only five stops, the print may have a near infinite number of shades between the lightest and darkest portions of the print.