Keying  
Almost in post production, there some tasks to do like : "layering moving pictures over others" or embedding 3d content into real shooted footage. In fact anamorph HDV material in interlaced formats is just a joke and gives nothing more than an SD resolution key even with so called HD footage. Ok, to pull a key from HDV material is possible but extremely painful and you need to make huge compromise to the quality of the results even if YOU ARE A CRACK on FLINT/FLAME/INFERNO or FUSION or COMBUSTION , NUKE or SHAKE. I know, there exists some other Software solutions out there like AFTEREFFECTS or apple MOTION and the basic key solutions in AVID or FINALCUT or EDIUS or whatever edit stations.

With footage what is really aquired in an PROGRESSIVE format like XDCAM EX HD 1080p24/25... you can pull the blue/green screen key without any compromise. But thats only possible with an WORKAROUND to blurr the red & blue channel, because XDCAM EX HD means full luma and 960x540 chroma resolution. It is just 4:2:0 subsampled footage. But it seems good enough to get the job done. In an STUDIO you can use the HD-SDI out to capture the pictures in front of the greenscreen in 10bit 4:2:2 directly into your EDIT SUITE. That would mean you get out 1920x1080 pixel luma resolution and 960x1080 pixel chroma resolution.

So if you shoot PERSONS, you can rotate your cam -90 degree to get the whole picture into MORE pixel space.

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