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.
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friolator @ Feb 29th 2008 5:47PM
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.