# Wikipedia Authors - Luma (Video) (Highlights) ![rw-book-cover|256](https://readwise-assets.s3.amazonaws.com/static/images/article2.74d541386bbf.png) ## Highlights - For the Rec. 709 (and sRGB) primaries, the linear combination, based on pure colorimetric considerations and the definition of relative luminance is: $ {\displaystyle Y=0.2126R+0.7152G+0.0722B} $ ^398254925 #latex