SCREEN REPLACEMENT
what is green screen replacement
you record your subject in front of a green backdrop, then use special editing software to replace every pixel of that specific green color with another image or video. This substitution process allows the software to seamlessly put a different background behind your subject.
You would first use the Tracker to calculate four separate tracks, one for each corner of the feature.
Next, you would attach a CornerPin2D node to the image sequence you want to use as the replacement for the feature, and apply to it the tracking data. This would remap the image sequence’s corners to the correct positions over time .
Using the CornerPin Node
The CornerPin2D node is designed to map the four corners of an image sequence to positions derived from tracking data. In practice, this node lets you replace any four-cornered feature with another image sequence. For example, suppose you needed to replace the mobile image in the fast-panning shot shown below.
STEPS INVOLVED IN MOBILE SCREEN REPLACEMENT
Working with Nodes
Nodes are the basic building blocks of any composite. To create a new compositing script, you insert and connect nodes to form a network of the operations you want to perform to layer and manipulate your images.
Nuke’s CornerPin2D nodes are specifically designed to receive tracking data via linking expressions, but you can apply tracking data in this manner to virtually any Nuke node. For example, you might animate a Bezier shape with tracking data by entering linking expressions into the Bezier node’s transformation parameters.
FINAL OUTPUTS
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