In photography, light value has been used to refer to a "light level" for either incident or reflected light, often on a base-2 logarithmic scale. The term does not derive from a published standard, and has had several different meanings: An arbitrary value indicated by an exposure meter such as the Weston Master V, discussed in Adams (1948, 14–18).
In photography, light value has been used to refer to a "light level" for either incident or reflected light, often on a base-2 logarithmic scale. The term does not derive from a published standard, and has had several different meanings: An arbitrary value indicated by an exposure meter such as the Weston Master V, discussed in Adams (1948, 14–18).
Source: Wikipedia "Light value" · CC BY-SA 4.0
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