How to create 12bit Prores4444 from an image sequence

Hi,
there seems to be a lot of confusion on the web regarding the bit depth of Prores4444. The white paper states that is supports "up to" 12bit for color components (YCrCb or RGB) and "up to" 16 bit for alpha and people seem to disagree whether it always uses 12bit or whether it uses 10bit when no more is needed.
Having said that, I would like to create a Prores4444 file from a sequence of 16bit (per component) images (I could produce png or tiff or dpx) and for obvious reasons ensure I get the full 12bit of colour and the full 16 bit of alpha.
So, two questions:
How do I do that? I have final Cut Studio installed. Does Compressor offer that? Do I have to do something special to achieve this or will it automatically do this right based on the input material?
How to I check if the result is really 12bit? Is there any tool that will tell me, if the resulting file is really a 12bit file (provided the "up to" in Apple's whitepaper was no accident)?
Thank you in advance,
Robert

The only part of this equation that I can speak to is converting an image sequence to a quicktime move.
Simplest way to work with an image sequence is to use quicktimeplayer7 to open an image sequence and then save it. It will save as a quicktime with the same properties as the individual image files. You will have to define the desired frame rate. If I remember correctly, quicktime player 7 is an optional install on the snow leopard disk. Not sure if it's still included with Lion or Mountain Lion.
You can change the still image default length to one frame and import all your still images into fcp and then simply drag them to the timeline, but fcp will struggle to play the sequence. If you need to work this way, you should immediately export as a quicktime.
Also, be sure and use leading zeros in numbering your image sequence as apple (and fcp) will not sort files properly, unless for example, your files are labelled. 001, 002, 003, etc. (assuming you have less than 1000 files).

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