Terminology explained - luminosity, luminance, luma, lightness, etc.

Capturing
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Luminosity, luminance, luma, lightness, brightness, value, etc.
This concise article explains the difference between these terms:
http://changingminds.org/explanations/perception/visual/lightness_variants.htm

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Interesting article. Good to have all on one page. However, it does not alter my previous conclusion: These terms are highly context dependent. One should always refer to the context/spec when using these terms technically. And, the article should be more precise about the terms power and energy :stuck_out_tongue_winking_eye:.

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I became uninterested when multiple sections mentioned HSL. As @chris said, it could be more precise (accurate?), though it is great to have all that on one page. Elaboration and examples would have been nice too.