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Old November 24th, 2003, 07:39 PM   #1
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Grain animation ?

Hi,

I'm new to the film look, but I can't help noticing the grain animation on the big screen. Do you feel that this soft edge animation is part of the pleasant look of film ? Some packages offer such grain animation, but it really doesn't look quite right. Have any of you
tried these techniques? Is it a resolution issue in that the grains are just too big on DV resolution ? I'm also wondering if the grain animation simulations aren't particularly good because they have been constrained to finish the job in a particular time. In audio effects, many non-linear operations are calculated on over-sampled data, thus reducing aliasing artifacts. I am guessing this is a good explanation for why film still has that soft edge look even *after* going back to video.
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Old November 24th, 2003, 09:03 PM   #2
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Check out Grain Surgery
http://www.visinf.com/gs/ae/

Free Demo.

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Old November 24th, 2003, 09:35 PM   #3
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Thanks for the link. It looks Grain Surgery offers much control over the grain animation. I'll download the demo and check it out.
Good antialiasing on grain animation for video-rate image processing is still probably too CPU-expensive for today's computers. From rough calculations, it seems like the stuff would
run at roughly 1/10 frame/second on today's fastest PC. Video-rate digital signal processing used to be impossible. Almost there ...
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Old November 24th, 2003, 10:41 PM   #4
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I've had success with discreet's grain matching tools (combustion, inferno).
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Old November 25th, 2003, 08:51 PM   #5
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A tip I remember from the Meyers AE book--

One of the reasons software noise/grain filters look so muddled or different on NTSC/PAL is due to the pre-existing low resolution the material is sourced at. They suggest uprezzing your footage (doubling or tripling the resolution, depending on what you like) and then applying the noise/grain to that, then shrink it back down to DV output resolution and it should look a bit more natural on playback. When shrinking it down, the larger grain should appear a bit finer (is the logic I think). I hope this helps.
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