My CG footage is just too nice

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  06 June 2003
My CG footage is just too nice

Hi all,

I am mixing 3d footage (a teddy bear) with real footage (a child bedroom) recorded with miniDV. I have matched lights and shadows, but one thing I would like to do is deteriorate the 3d bear, so it 'd look as if i'd recorded it with a miniDV camera, not as a perfect 3d bear.

I have tried (in After Effects) to put some noise and little mosaic tiles but with little success.

Has anyone have a method for this?

Thanks for your time
  06 June 2003

I'm not sure how to do this in After Effects, but to start maybe try adjusting the saturation (lower), and add a grain or pixelize to the cg elements.

This might help improve quite a bit. Like I said, just as a starting point for you.
  06 June 2003
one of the largest diferences you'll notice is that DV is 4:2:2 or even 4:1:1 color space. This is akin to mpg video compression. Right now your 3D is going to be rendered 4:4:4 or uncompressed.

What you need to do is to seperate the luma (4) and 2 chroma channels (2 or 1) of the 3d, and down rez them.

Look for a way to convert your 3D to YUV color space, and then scale the U&V to 1/2 or 1/4 rez.

Not too sure how to do it in AE.... Might require the production bundle.
Jason Kolodziejczak
Digital Fusion Consultant
Toronto, Canada

Last edited by Jayk2k : 06 June 2003 at 10:43 PM.
  06 June 2003

Thanks for your replies,

I have trying to take control over YUV channels, but AFX seems to lack the RGB>YUV color space conversion.

So I separate the RGB channels (one layer, one color) and then applied the Mosaic effect (less resolution) to two of the colors/layers, and mix them with "Add" blending mode. Then a little bit of noise to the 3rd color/layer.

It looks more "miniDV", but I think the YUV separation would be the perfect choice...

  07 July 2003
I've never tried this but in theory I think it works. Try exporting your 3D to DV tape in separate passes. Then reimport it into AE. Apply your alphas and recomposite it. Good luck.
  01 January 2006
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