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a quick explaination of 4:2:2 or 4:1:1 more commonly seen in Digital Cameras In the mid to high end range
4:2:2
The two chroma components are sampled at half the sample rate of luma, so horizontal chroma resolution is cut in half. This reduces the bandwidth of a video signal by one-third with little to no visual difference.
Many high-end digital video formats and interfaces use this scheme:
DVCPRO50 (50 mhz) and DVCPRO HD
Digital Betacam
HDcam
XDcam
4:1:1 is used for minidv, DVcam and DVCpro (25 mhz) A single sampling of Lumance and Chromance ... in lamen terms .. less Detail then 4:2:2 you can put more information in less bandwidth
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