If all you want to do is blur out a background, and there's not a lot
of motion, this is what I would do:
1. Copy my footage to the layer above. Call that layer MASK.
2. Use the pen tool to cut out from MASK the shape of what I want in focus.
3. Apply my blurring or whatever effect to MASK.
I'd have to fiddle with the settings of the mask cut by the pen tool.
might have to reverse the mask, probably feather the edge a bit.
If you have a lot of moving around, then it's a little more
complicated, and I would add:
4. Animate the mask shape by keyframes in accordance with the video.
I had to do something like this for a band video last month -- they
light the drumset all weird, so I had to apply a color correction to
ONLY the drumset. This was basically how I did it, except that for
step #3, instead of blurring, I applied a color correction to it.
It's also the same trick that allows you to do a Sin City style image
-- you can cut out your Beautiful Item using a mask, and then mute the
color of your background layer. You have to animate your mask by
keyframes, which can be a real bitch for an organic shape (such as a
chick in a red dress), but for a geometric shape is a lot easier.
You might also be able to MOTION TRACK your mask to an item in the
background. If you can do that, then you've simplified your job a
LOT. I've done that for a couple of movies, where we wanted to get
rid of a logo or some other bit of set dressing that no one noticed
while filming.
It's an easy trick that gives you a LOT of power.
Hope that helps!
Cheers,
Edward
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