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Keylight and DV footage…
I’ve been wrestling with this for some time, but I’m interested to see what advice people have to offer me.
I’m using Keylight to greenscreen footage, but the TV station I work for only has DV cameras (GL2s and JVC DV5000s), and we’re using Premiere Pro, which only captures to DV. Keylight doesn’t work very well with DV footage, because
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4 Replies
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You can use the Channel>Channel Combiner effect to go from RGB to YUV (YCrCB) color space in which the ‘red’ channel in AE will contain the luma, while the ‘green’ and ‘blue’ channels will contain chroma information. Then you can either apply a Blur>Channel Blur to the green & blue channels (watch them as you do this, see what happens and compare it to the luma channel) or use a Noise & Grain>Median effect (try a setting of 3) which should give better results, but is more complicated to impliment. Median affects all 3 channels, so you need a way to get the default luma channel back before you apply Channel>Channel Combiner again and go back from YUV to RGB.
Darby Edelen
DVD Menu Artist
Left Coast Digital
Aptos, CA -
Wow, thanks for the explanation, that makes a lot more sense. I kinda get it. I’ll look around for some more in depth descriptions later; it’s good to know how something you’re using works.
But in any case, when I’m going back through my greenscreen footage, now, I’m noticing that all the material shot with our JVC-DV5000s, and automatically encoded to AVI within the HDD keys A LOT better than the footage that was captured into Premiere Pro from the studio cameras. I guess that not all DV encoders are created equally?
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Median affects all 3 channels, so you need a way to get the default luma channel back before you apply Channel>Channel Combiner again and go back from YUV to RGB.
And how would I do that?
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[Prime Mover] “And how would I do that?”
The best way to do it would probably be to allow the luma channel to remain as it is after the Median effect. Then do your keying to generate a matte with this slightly funky looking, but more readily keyable footage. Then apply the matte to your original footage (Track Matte or Set Matte). If you have color spill on the original footage you could apply an instance of Keylight solely to despill, or use AE’s Spill Suppressor effect.
Darby Edelen
DVD Menu Artist
Left Coast Digital
Aptos, CA
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