Working with 32bit tga sequence that is rendered from PI is really not a
problem at all. Just render them to their own directory then when importing
into PPro, select the first file and check numbered sequence in the import
interface. This will show up as a single clip in PPro. What I do from that
point is to bring the clip to a sequence in PPro and export movie...it is
there that I choose no compressor and millions of colors +. This will create
a 32 bit avi with alpha channel that you can then place over any video clip
you would like. After you have created this uncompressed 32bit avi you can
delete the rendered targa files.
As far as using two avi files, one with image and one with alpha info, place
the alpha track above the image track on the timeline and apply the Track
Matte Key to the image clip. Turn off the eyeball on the track with the
alpha and choose it as the Matte Track in the effect. What is white in the
alpha clip will be white, black will be transparent and shade of gray will
be varying levels of transparency.
You can also bring your background avi clips into PI as a layer and do the
compositing there as you create the particle effect. I find this is usually
best in that I can place the emmiters exactly where I want them in releation
to the background image, say if you had a moving car and you wanted its
tires to be on fire.
Then the output can be a "normal" avi that you import int PPro to edit into
your timeline.
Regards,
Richard Peoples
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