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HD Render Degraded – interlace problem?
I have been working on an HD project (1920 x 1080 @ 25fps) which comprises video composited into 2d animation.
Client provided a targa sequence of the video (not de-interlaced) which I imported as sequences in AE then keyed with Keylight and rotoscoped.
Rendered with all the correct settings (Best Settings, Alpha Channel etc) the results was a grainy mess.
Where does the problem lie? Should the video be de-interlaced before compositing? Is there specific render options to optimise HD files?
I use AE6.5 on a dual G5 Mac (PPC) on 4Gb of RAM. -
1 Reply
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since you are keying, i would make sure to have ae correctly separate fields, otherwise when you tighten/choke the key you will lose the interlacing around the edges of what you are keying, which will make moving parts look strange.
as far as graininess, ae should be adding any grain and the render settings (lossless with alpha) would not degrade the image either. is the footage grainy already? if so it is pretty difficult to remove the grain. there is a remove grain effect, and andrew kramer (click his face on the ae forum page) has a tutorial showing his technique for using it to smooth out grain.
if the keyed footage is grainy, you may also want to add some grain (or noise) to the background footage to help it blend/match a bit better.
or are you talking about a bad key… like the transparent areas are grainy. then it’s just a bad key, try choking it a bit or tweaking the keying effect’s settings. aharon rabinowitz’s super tight junk mattes tutorial and barend onneweer’s procedural matte tutorial (both on the ae forum page) are good tutorials for keying.
Kevin Camp
Designer – KCPQ, KMYQ & KRCW
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