See here for a demonstration of RGB bars (100%, 75% and EBU) and their conversion to YUV in BT.601 and BT.709 colour spaces:
http://mdsh.com/RGB-YUV/
- ITU-R Recommendation BT.601 - Rec. 601 or BT.601 or its former name CCIR 601
http://en.wikipedia.org/wiki/Rec._601- ITU-R Recommendation BT.709 - Rec. 709 or BT.709
http://en.wikipedia.org/wiki/Rec._709- Society of Motion Picture and Television Engineers SMPTE-170M ("Television-Composite Analog Video Signal-NTSC for Studio Applications") or bt470bg
http://www.w3.org/Graphics/Color/sRGB