2D Tracking
We’ve taught 2D tracking which is a way out for us to blend images or vids into other shots.There are three types of trackings：
Four-point tracking is the kind of track combination that produces perspective movement—movement in the pseudo third dimension (not really 3D but looks like 3D).In other words, you can produce things that are turning away from the camera.
By tracking the right number of points, you can tell Nuke to create the right kind of movement using the Tracker node—be it stabilizing or match-moving that movement. By activating move tracks, tracking each one in turn, and then using the T, R, and Scheck boxes, Using Nuke nodes to create T (transform), R(rotation), and S (scale) movement.
Color correction
I think the color correction is tailored toward artistic modifications, something like Lightroom, and tries to do a lot of things in one node; masking, cross channel operations (saturation), and hence it’s also somewhat unpredictable except by experience， whereas the grade node is much simpler; multiply and plus by a constant and that’s it (apart from gamma). Generally, it’s predictable.
We can divide the color correction into three parts Highlights, Midtones, and Shadows.
Cleanup
We are taught roto paint in Nuke this week. Generally speaking， Nuke features a vector-based RotoPaint node for help with tasks like rotoscoping, rig removal, garbage matting, and dust busting，and there are two similar nodes in Nuke for rotoscoping, Roto and RotoPaint. The main difference between these two is that you can only create and edit Bezier and B-spline shapes with Roto, while RotoPaint allows you to draw paint strokes too with various brushes. So the Roto node is an optimal choice if you’re doing rotoscoping only, whereas RotoPaint gives you a broader scale of tools to use.
The most manual of all the techniques: painting out each marker. This approach may be necessary if hair or an edge goes over the marker, and the other methods aren’t providing the results you need. As a brute force approach, it produces results 100% of the time, but it takes more attention and effort.