Help in compositing! Over Black Animation

Ax wrote on 5/15/2002, 4:21 PM
Well if suppose its not complicated but i cannot find !!
So here it is the small thing:

I have a landscape picture and a AVI file wich is a spacecraft that move over black background
and the problem is : I want to superpose the AVI to create spacecarft in the landscape! Simple?
cause actually i cannot supperpose the 2 without having black on all over the picture!!

Thanx in advance!

Ax

Comments

SonyDennis wrote on 5/15/2002, 5:05 PM
Put background on track 3. Put spacecraft (with black background) on tracks 1 and 2
On track 1, use "Black and White" and "Brightness/Contrast" filters to blow out track 1 into a white silhouette on black -- what we call a "mask". When this is working right, make track 2 a child of track 1 (using the arrow to the left of the track header), which will cause track 1 to mask track 2, over track 3. Just that easy, you're done.
///d@
Ax wrote on 5/15/2002, 6:02 PM
Well, i succed in BW mask
bur i got semi transparent Spacecraft!
I have tried many compositing mode for all
and video mask method but dont succeed!!

I have doen all what you sayed!!
I can upload you the files if you want!!

Thanx
Ax wrote on 5/15/2002, 6:07 PM
Well the result is like adding spacecraft to Landscape
It overlight the spacecraft and make him semi transparent
SonyDennis wrote on 5/17/2002, 12:03 AM
The key is to make sure the mask is full white where you want the spacecraft to be solid. You can use the Brightness/Contrast filter for this. Probably you'll want the Black and White filter ahead of it. Where the mask is black, the background shows through, where it's white, the spacecraft. Grays will cause semi-transparent bits of spacecraft.

Check out the Transporter example discussed in other posts here on how to pull a mask from an image (or, in that case, a difference between two iamges). Very similar techniques.

ftp://dude:sweet@porker.sonicfoundry.com/Sample%20Projects/Transporter/

When you don't have a real mask, and you're making one from an image, you will never have a result as good as if you shot a mask using a green/blue screen or silouette lighting (a second photography pass).

///d@