2D Tracking - Nuke 101: Professional Compositing and Visual Effects - page 234

Sits beautifully, snug, in the frame, doesn't it? Too snug maybe.
8. Double-click Rectangle1 to load its Properties panel into the Properties Bin.
9. Set the Softness value to 20.
You also need to blur the image a little—it was scaled down so much by the
CornerPin node that it has become too crisp and looks foreign to the background.
10. Attach a Blur node to CornerPin2D1 and set its Size value to 2.
You have now added motion to an image that didn't used to have it. When that
happensoutsidethecomputer,theimagegetsblurredaccordingtothemovement.
Doing it after the fact on the computer is called adding motion blur . It is import-
ant to add motion blur to movements generated inside Nuke to make them more
real looking; the next section happens to be about just that.
Adding motion blur
Here we will look at two of the several ways to add motion blur. In every motion-gener-
ating node there's a motion blur property you can turn on. Although that's a rather taxing
option on the ol' processor, it is sometimes used. FIGURE 5.32 shows the three motion
blur properties.
Figure 5.32. Motion blur properties.