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How is brightness measured?

Wikipedia states that "brightness is the perception elicited by the luminance of a visual target". But what are the units of measurement for brightness? …
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How is brightness measured?

This value represents brightness. If the brightness is set to zero than it represents black. If the value is set to 256 for red than it means red elicits color at maximum power. … In other words, brightness is the value of the color component of a pixel. In photoshop brigthness is measured in percentages …
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