Hello folks!
I know it is possible to save a png with a transparent background but is this also possible to do as a movie? My goal is to get it in to after effects and make into 3d-layers and make the trees for instance cast shadow. Always when i open a movie in after effects the background is either white or black if you made it transparent before rendering.
Would really appreciate some help here!
/ henrik
Oh and keying out the white or black is not an option as it works poorly. Choosing add or multiply as blending modes are neither as i want the lights to cast shadow from the tree object and not from the square image file.
Saving movies containing an alpha-channel
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Can you download this movie file: http://www.contextfreeart.org/download/ ... ha_hsg.mov and tell me if it has an alpha channel that After Effects can use?
It looks totally black in QuickTime Player. But that is just because the transparent parts are drawn as black and the opaque parts happen to be black too. In Quartz Composer there appears to be a correct alpha channel.
It looks totally black in QuickTime Player. But that is just because the transparent parts are drawn as black and the opaque parts happen to be black too. In Quartz Composer there appears to be a correct alpha channel.
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Yes, it is a black image on a transparent background with premultiplied alpha, so it would look totally black by itself. You weren't able to composite the movie track with an image or add another movie track behind the one with alpha? In Quartz Composer I can definitely see an alpha channel.
Here is another movie that has some color along with a transparent background:
http://www.contextfreeart.org/download/ ... alpha2.mov
Here is another movie that has some color along with a transparent background:
http://www.contextfreeart.org/download/ ... alpha2.mov
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