21. The 4 : 2 : 2 chrominance format indicates that half the chrominance values have been deleted. 22. If no chrominance values have been deleted, the chrominance format is 4 : 4 : 4. 23. If no chrominance values have been deleted, the chrominance format is 4 : 4 : 4. 24. In the second arm, the chrominance signal bypasses the Zener diode through a band pass filter. 25. It was necessary to assign a narrower bandwidth to the chrominance channel because there was no additional bandwidth available. 26. Conventional monochrome TV sets will accept this signal as if there were no chrominance or burst signals at all. 27. Markers indicating luminence or chrominance _ definitions of brightness and color, respectively _ are limited to a predetermined amount. 28. RCA worked along different lines entirely, using the luminance-chrominance system first introduced by Georges Valensi in 1938. 29. Another common practice to reduce the data rate is to " thin out " or subsample the two chrominance planes. 30. The 4 : 2 : 0 chrominance format indicates that three-quarters of the chrominance values have been deleted.
