October 23rd, 2010,12:35 PM
The ProRes "HQ" codec actually is 10 bit YUV, so depending on what exactly happened to the data between the scanner and the QuickTime files, you should have 10 bit images in there.
That said, whether it is linear/video/log - there's no way to tell from what you have said. It's also a completely separate issue from how many bits you have. It's perfectly possible for an image to be 10 bit linear, or 8 bit log, etc. (Though, 8 bit log would certainly be uncommon.) You'll have to talk to whoever did the transfer to find out what exactly was done with it as far as color space handling. Does it look like log? If it looks fairly normal, my first guess would be that your ProRes files are going to be in rec.709 color space, but that's purely speculation. (It's sort of the "standard" HDTV color space. If somebody was giving your HD res ProRes QuickTimes, I'd guess they would assume that's what you wanted.)
As far as converting 8 bit to 10 bit, of course it's possible to convert between the various formats. You just store each pixel with an extra two bits. It doesn't add any real data, though. It's like asking, can I convert the 5 digit number "345.73" into a 7 digit number. Of course you can. It's "345.7300"
What are you using to do your grading? Perhaps somebody will have used the same system, and they can suggest some specific settings for making sure that it uses the highest quality calculations that it can do.
Maybe this helps a little bit. If not, keep asking questions.
I never seem to notice 'visitor' messages until months later. In theory, a PM should email me to let me know I have a message.