4:2:0 - This is a set of frequencies in the ratio 4:2:0, used to digitize the luminance and color difference components (Y,R-Y,B-Y) of a video signal. The four represents 13.5 MHz - the sampling frequency of the Y channel while both the R-Y and B-Y are sampled at 6.75 MHz. Almost all satellite distribution uses 4:2:0 sampling to reduce bandwidth requirements.
4:2:2 - This is a set of frequencies in the ratio 4:2:2, used to digitize the luminance and color difference components (Y,R-Y,B-Y) of a video signal. The four represents 13.5 MHz - the sampling frequency of the Y channel and the twos each 6.75 MHz for both the R-Y, B-Y channels. D-1, D-5, Digital Betacam, and most digital disk recorders use 4:2:2 digitizing. Other names are: CCIR-601, SMPTE-125. 4:2:2 is typically used for video archiving and contribution. It works well for chroma keying. 4:2:2 requires roughly three times the bandwidth of 4:2:0
4:2:2 - This is a set of frequencies in the ratio 4:2:2, used to digitize the luminance and color difference components (Y,R-Y,B-Y) of a video signal. The four represents 13.5 MHz - the sampling frequency of the Y channel and the twos each 6.75 MHz for both the R-Y, B-Y channels. D-1, D-5, Digital Betacam, and most digital disk recorders use 4:2:2 digitizing. Other names are: CCIR-601, SMPTE-125. 4:2:2 is typically used for video archiving and contribution. It works well for chroma keying. 4:2:2 requires roughly three times the bandwidth of 4:2:0
