Alpha...how to do this?
- Thread starter kilmyneo
- Start date
I mean using the info from the Blue channel to generate an alpha channel.
Using the tree image above drop it in the timeline and duplicate the layer twice.
On the top most tree layer add a Channel combiner effect and an Alpha levels effect. Set the From to Blue and set the To to Alpha (see below). Tweak the Alpha levels to clean up the matte.
Your matte should look like this.
Use this layer as a track matte for the tree (fill) layer below. Set the the track matte to "Alpha inverted" (see below)
Drop in the image you want behind the tree between the 2 layers. Use garbage mattes as needed for clean up.
Note - this simple test was done from the jpeg in the original post, a single frame. This method may not work well for your actual footage. I would spend 5 minutes to try it before spending 5 days doing roto work on a bunch of leaves.
Using the tree image above drop it in the timeline and duplicate the layer twice.
On the top most tree layer add a Channel combiner effect and an Alpha levels effect. Set the From to Blue and set the To to Alpha (see below). Tweak the Alpha levels to clean up the matte.
Your matte should look like this.
Use this layer as a track matte for the tree (fill) layer below. Set the the track matte to "Alpha inverted" (see below)
Drop in the image you want behind the tree between the 2 layers. Use garbage mattes as needed for clean up.
Note - this simple test was done from the jpeg in the original post, a single frame. This method may not work well for your actual footage. I would spend 5 minutes to try it before spending 5 days doing roto work on a bunch of leaves.
http://www.videocopilot.net/tutorials/basic_sky_replacement/
Andrew Kramer's first tutorial covers roughly this effect.
just use the same sky replacement technique to sandwich the graphics between the original sky and the foreground elements with the sky keyed out
there is also this advanced sky replacement tutorial from when he got a bit better at AE and tutorials
http://www.videocopilot.net/tutorials/advanced_sky_replacement/
Andrew Kramer's first tutorial covers roughly this effect.
just use the same sky replacement technique to sandwich the graphics between the original sky and the foreground elements with the sky keyed out
there is also this advanced sky replacement tutorial from when he got a bit better at AE and tutorials
http://www.videocopilot.net/tutorials/advanced_sky_replacement/