Kevin Shaw
Member
XDCAM EX at HQ mode, 1920X1080 @ 4:2:0 is 960X540=518,400
DVCPRO HD at 1080 @ 4:2:2 is 1280X1080=691,200
Yes, the HVX200/200A/HPX170 imagers are pixel shifted, but there is still more color space than XDCAM EX HQ, yielding better chroma keying, more accurate color, more flexibility in color correction..
But the EX1 has as much recorded chroma detail as the HVX has at the sensor level, so if you transcode EX1 footage to an intermediate editing codec with 4:2:2 color it should key pretty well. The HVX may have an advantage for scenes with a lot of motion, while the EX1 has about twice the discernible resolution for general-purpose use.