Adobe 25510629 - After Effects CS3 Professional, Руководство пользователя

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102 How to
For sessions that don’t contain video clips, you must set a duration for the input clip
before you can preview the session and add pan and zoom points. Enter a time in the Out
Point field on the Input tab. If you’re not certain exactly how long the session will be with
the virtual camera moves, set a value higher than you expect to use, and then correct it
after you program all of the camera moves.
4.
Click the Add New Point button. A new entry is inserted in the appropriate order in the
list of pan and zoom points.
5.
Change the scale and position with the grid control. The Output Preview Monitor shows
the pan and zoom position.
6.
Repeat steps 3 through 5 for each additional point. To delete a pan and zoom point, select
it in the list, and then click the Delete Current Point button.
Changing a pan and zoom point
To change the setting for an existing pan and zoom point, click its row in the list in the Pan &
Zoom tab. The position and zoom settings change dynamically as you move the grid control
or manually change the values in the X, Y, and Z fields. However, the time setting does not
change dynamically when you select a point and preview the session, but rather requires a
discrete step, either clicking the Set to Preview Time button, or typing a framecount in the
Time field and pressing Enter.
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If the first, last, or both pan and zoom points are set to the session’s first and last frames,
respectively, and you change the total length of the session, then the times for those
points automatically change. The time setting for intermediate pan and zoom points,
however, do not change if, for example, you trim the In point of the input clip after
programming virtual camera moves. Therefore, Adobe recommends that you get the
session’s timing settled before designing pan and zoom maneuvers.
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The Output Preview Monitor always shows the visible area for the current frame in the
session. This means that if you drag the preview slider away from the frame for the
currently selected pan and zoom point and then change the zoom and position settings,
the monitor does not represent the new framing. You may see a change in the framing
for the current timepoint, but that’s because changing a pan and zoom point affects the
visible area for all of the frames between that point and the one on either side. To have
the Output Preview Monitor show exactly where a pan and zoom point is, the current
frame must precisely match the current pan and zoom point. To jump to that frame,
deselect and reselect the current point.