| luminance |
Although brightness is often used interchangably with luminance, we prefer to use the term "lightness." This concept deals with many of the same variables as value but using a different mathematical equation. Check out our own definition of LUMINANCE/LIGHTNESS or more simply, think about the Color Wheel as colors having equal luminance. Adding white will increase lightness and adding black will decrease it.
출처: www.colorcube.com/articles/theory/glossary.htm
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