8bit 50Mbps or 10bit 35Mbps - which is more important?

J

jedi general

New member
We are about to do a series with alot of greenscreen keying in it. We are looking at 2 cameras for the filming - the Sony EX3 and the Canon XF305. We are recording direct to computer (so we can use the HDSDI for higher quality capture). In this scenario the EX3 will do 10bit 35Mbps and the XF305 will do 8bit 50Mbps as far as I am aware.

My question is what would be the best choice for Keying? Is it better to have the 10 color depth at only 35Mbps or only 8 bit color depth but 50Mbps?

Any assistance gratefully received,

Jedi
 
If you're recording on the computer you can pick any Mbps you want. The most important aspect for keying is that you use 4:2:2 color.
 
Barry is correct. If you're recording over SDI directly to a computer, you can record uncompressed, ProRes, DNxHD, DPX, whatever your computer & drive system will support. If you're serious about getting the best capture, make sure you have a honking big & honking fast drive array.
 
But "uncompressed" doesn't necessarily tell you anything. If the ADC is 6-bit, it doesn't matter how little you compress the signal after that point, you're only getting 6-bit words.
 
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