Epson ELPLP29 - Manual (Page 66)

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Appendices > Glossary
YCbCr The carrier signal contained in the colour bar signal
used in modern (NTSC) TV transmissions. The
name comes from the Y (luminance) signal and the
CbCr (chroma (colour)) signals.
YPbPr The carrier signal contained in the colour bar signal
used in high-definition TV (HDTV) transmissions.
The name comes from the Y (luminance) signal and
the PbPr (colour difference) signals.