it's extremely common in high end CGI compositing to strip all grain from film images, merge film and CG stuff together, then re-apply a grain profile to the output. Happens all the time. it's how CG stuff can be made to look realistic, and how it's blended in with live action seamlessly. The grain isn't necessarily artificial - it's possible to create a grain profile that mimics actual film grain. The advantage to this process is more efficient encoding (read: fewer artifacts). In the end, you'd never know.
Let the hive mind of Engadget get that for you.
"I need help! I want a small pocket camcorder but I'm not sure which one to get. I don't want to fall into the hype of the Flip because I worry two hours won't be enough. What should I be looking for when considering a small camcorder and where can I get a good quality one with expandable memory? Thanks!"
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