Join Lee Lanier for an in-depth discussion in this video Refining keyed edges, part of VFX Techniques: Building Replacement with After Effects.
We've successfully integrated the sky…and the sky is looking pretty nice against the buildings.…One place that doesn't look so good is next to the tree.…If I zoom in I can see there is a heavy white line trapped here.…Now it's going to be difficult to deal with that on one layer.…What we can do though is cut the trees out of the background then add them back…to new layer and treat them differently. Let's do that.…So on the first frame I am going to draw a new mask to subtract these trees.…So Pen Tool and draw a mask.…I am going to start just above the street sign.…
While I'm at it I can deal with another problem and that's the fact that there is…this little dot right here.…This is actually a street lamp that got mostly eroded.…We can draw the mask in such a way that that gets cut out also.…So I am going to finish this mask and go up, cut out this top tree also.…It's okay to cut out part of this building that gets replaced anyway, across and back down.…Now initially the mask is set to Add.…But I can reverse the effect, I go down to Mask 1 and switch that to Subtract.…
Learn how to track the footage with the Adobe After Effects 3D Camera Tracker, replace areas such as the sky, rotoscope moving elements such as buildings and cars, and integrate a digital matte painting so it gains appropriate shifts in perspective and scale. You'll also apply color-grading techniques and learn how to fabricate reflections. The course also covers an alternative motion-tracking workflow with the Foundry CameraTracker plugin.
- Using the After Effects 3D Camera Tracker
- Applying tracking data to 3D layers
- Constructing and refining motion graphics
- Keying out the sky
- Rotoscoping to remove and save features
- Using the Foundry CameraTracker plugin
- Creating reflections
- Color grading