Editing Y′UV (section)

== Relation with Y′CbCr ==
Y′UV is often used as a term for [[YCbCr]]. However, while related, they are different formats with different scale factors; additionally, unlike YCbCr, Y’UV has historically used two different scale factors for the U component vs. the V component.<ref>{{cite book |url=http://www.poynton.com/PDFs/YUV_and_luminance_harmful.pdf |access-date=18 November 2016 |chapter=YUV and luminance considered harmful |title=Digital video and HDTV algorithms and interfaces |date=2003 |first=Charles |last=Poynton}}</ref> Not scaled matrix is used in [[Photo CD]]'s PhotoYCC. U and V are bipolar signals which can be positive or negative, and are zero for grays, whereas YCbCr usually scales all channels to either the 16&ndash;235 range or the 0&ndash;255 range, which makes Cb and Cr [[signedness|unsigned]] quantities where [[Offset binary|128 represents gray]].

Nevertheless, the relationship between them in the standard case is simple. In particular, the Y' channels of both are linearly related to each other, both Cb and U are related linearly to (B-Y), and both Cr and V are related linearly to (R-Y).