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creating quicktime movie with transparent boundaries
Hi to all,
I did a tutorial by Bjorn Sjostrom a while ago ( (a beginners’s guide to 3d after effect)
and he had these quiktime movies of flying “junk” with transparent boundaries of the file and just the object inside was showing. well how do you get that to happen? All I know is that they consist of an alpha channel, compressed with an animation codec.
Could someone elaborate on how I could get a quicktime movie just showing the object inside with the file having transparent boundaries?
Many thanks in advance,
and thanks Roland Kahlenberg for solving my prior query
alfredo
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1 Reply
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First of all, to have a usable alpha channel, you’ll need to make sure that your background is actually transparent. Switch on the transparency grid (in the bottom of the Comp Viewer), and make sure you see the grid where you want the comp to be transparent.
Upon exporting, make sure you select a codec that supports an alpha channel. Quicktime Animation is one, so is PNG compression.
In the output module select RGB+Alpha, and make sure you render to “millions of colors +”.
Note the “+” there. It means an alpha channel will be included.
Bar3nd
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