Apple Shake 4 Tutorials Instrukcja Użytkownika Pobierz pdf (Strona 201)

201

7 Tracking and Stabilization

This tutorial demonstrates the primary uses for Shake’s

tracking technology, including removing unwanted

motion from an image sequence and “matchmoving” an

element to the motion of another element in the

composite.

Tracking allows you to do two things. First, you can eliminate unwanted movement in a

plate, such as the movement caused by film gate weave. This is known as stabilizing.

Second, you can match a stable element to a moving element, such as swapping the

heads of two actors. This is called matchmoving. You often use the two together. For

example, to do a head replacement, you typically first stabilize the head you want to

grab, then matchmove it to the body you want to place it on. Both involve tracking

patterns in an image sequence from frame to frame. This can be done manually, but

that gets really tiresome, really fast—which is why Shake provides tracking nodes to do

it for you.

Tutorial Summary

• Tracking and stabilizing nodes

• Stabilizing an image sequence

• Converting stabilization data to matchmove data

• Using the MatchMove node (with a four-point track)

• Positioning a foreground element

• Color-correcting a foreground element

Tracking and Stabilizing Nodes

In Shake, three nodes track sequences of images:

• Transform–Tracker: This node generates unlimited tracking points, but does not

apply movement to the element.

1 2 ... 196 197 198 199 200 201 202 203 204 205 206 ... 259 260

Brak uwag

Apple Shake 4 Tutorials Instrukcja Użytkownika Strona 201