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«PROFESSIONAL USER GUIDE © 2007 Adobe Systems Incorporated. All rights reserved. Copyright Adobe® After Effects® CS3 User Guide for Windows® and ...»

-- [ Page 32 ] --

When you click the stopwatch button to deactivate it, keyframes for that property are permanently removed and the value of that property becomes the value at the current time. You cannot restore deleted keyframes by clicking the stopwatch button again. Deleting all keyframes does not delete or disable expressions.

• To temporarily disable keyframes for a property, add an expression that sets the property to a constant value. For example, you can add this very simple expression to the Opacity property to set it to 100%: 100.

Click the Enable Expression button to toggle the expression on and off, which toggles the keyframes off and on as a side effect.

If you accidentally delete keyframes, choose Edit Undo.

See also “About animation, keyframes, and expressions” on page 183 “Work with the Graph Editor” on page 184 “Shortcuts for keyframes” on page 650 “Shortcuts for showing properties in the Timeline panel” on page 647

–  –  –

Value graph A. Keyframe. B. A level value graph indicates unchanging values. C. A rising graph indicates increasing values. D. A falling graph indicates decreasing values.

You can change layer property values by moving the points (keyframes) on the value graph up or down. For example, you can increase a Rotation keyframe’s value by dragging a keyframe marker on the Rotation property’s value graph higher up on the graph.

Note: Values for the Anchor Point, Mask Path, effect control points, 3D Orientation, and Position properties are spatial, so they use speed graphs by default instead of value graphs.

1 In the Timeline panel, display a temporal property for a layer.

2 If necessary, click the Graph Editor button or press Shift+F3 to enter Graph Editor mode.

3 If necessary, add a keyframe at the point in time you want the change to occur.

4 Drag the keyframe up or down to set a new value for the layer property.

See also “Work with layer properties in the Timeline panel” on page 152 “Work with the Graph Editor” on page 184 View or edit a keyframe value

• Move the current-time indicator to the time of the keyframe. The value of the property appears next to the property name, where you can edit it.

• In layer bar mode, right-click (Windows) or Control-click (Mac OS) the keyframe. The keyframe value appears at the top of the context menu that appears. Choose Edit Value to edit the value, if desired.

See also “Keyframe menu commands” on page 189 “Work with layer properties in the Timeline panel” on page 152

–  –  –

Note: When copying and pasting between the same properties, you can copy from more than one property to more than one property at a time. However, when copying and pasting to different properties, you can copy only from one property to one property at a time.

1 In the Timeline panel, display the layer property containing the keyframes you want to copy.

2 Select one or more keyframes.

3 Choose Edit Copy.

4 In the Timeline panel containing the destination layer, move the current-time indicator to the point in time where you want the keyframes to appear.

5 Do one of the following:

• To paste to the same property of the copied keyframes, select the destination layer.

• To paste to a different property, select the destination property.

6 Choose Edit Paste.

See also “Work with layer properties in the Timeline panel” on page 152 “About animation, keyframes, and expressions” on page 183 “Shortcuts for keyframes” on page 650 “Shortcuts for showing properties in the Timeline panel” on page 647 Edit keyframe values using a spreadsheet You can copy and paste keyframe data as tab-delimited text for use in a spreadsheet (such as Microsoft Excel) or other text-editing program. This allows you to take advantage of the powerful features of spreadsheet programs, either for numerical analysis of keyframe data or for the creation or editing of keyframe values.

You can copy and paste most properties, including the Transform properties (such as Position and Opacity), Material Options properties, and motion trackers.

You can use the motion tracking tools to track the motion of an object in a layer, and then paste the tracker data into a spreadsheet to perform numerical analysis on the data.

You can copy keyframes from only one layer at a time as tab-delimited text.

1 In the Timeline panel, select keyframes for one or more properties on the same layer. To select all keyframes for a property, click the property’s name.

2 Move the current-time indicator to the first selected keyframe. Write down the time of this keyframe. (When you paste the edited data back in, you will need to paste it at this time.) 3 Choose Edit Copy.

4 Paste keyframe data into the spreadsheet. Assuming that the first column in the spreadsheet is labeled A and the first row is labeled 1, you should paste into cell A1. Frame numbers appear in column B. Property values appear in columns C, D, and E, depending on the dimensions of the property. (Position in a 3D layer has values in all three columns; Opacity has only a value in column C.) 5 Edit the numerical information for the keyframes. Do not change any text other than frame numbers and property values.

AFTER EFFECTS CS3 193 User Guide 6 Select the cells that contain your data. The top-left cell in your selection should be A1. The bottom row of your selection should be the row that contains the text End of Keyframe Data.





7 Copy the data from the spreadsheet.

8 In After Effects, move the current-time indicator to the time at which you want to paste the new keyframe data.

This will usually be the time of the first keyframe that you selected and copied at the beginning of this procedure.

9 Choose Edit Paste.

See also “Work with layer properties in the Timeline panel” on page 152 “About animation, keyframes, and expressions” on page 183 Move keyframes in to another time With multiple keyframes selected, you can copy or delete them simultaneously or move the keyframes together without changing their positions relative to each other.

1 Select one or more keyframes.

2 Drag any of the selected keyframe icons to the desired time. If you selected multiple keyframes, then all of the selected keyframes maintain their relative distance from the keyframe that you drag.

See also “Select keyframes” on page 188 “About animation, keyframes, and expressions” on page 183 “Shortcuts for keyframes” on page 650 “Shortcuts for showing properties in the Timeline panel” on page 647 Move a keyframe to a specific time 1 Move the current-time indicator to the desired time.

2 Do one of the following:

• In layer bar mode, hold down Shift after you begin to drag a keyframe icon to the current-time indicator.

• In Graph Editor mode, drag a keyframe to the current-time indicator.

When you drag over the current-time indicator, the keyframe snaps to the current-time indicator.

–  –  –

Expand or contract a group of keyframes in layer bar mode 1 Select at least three keyframes.

2 Hold down Alt (Windows) or Option (Mac OS) and drag the first or last selected keyframe to the desired time.

See also “Select keyframes” on page 188 “About animation, keyframes, and expressions” on page 183 “Shortcuts for keyframes” on page 650 “Shortcuts for showing properties in the Timeline panel” on page 647 Move a layer duration bar but not its keyframes 1 Make a note of the time at which the first keyframe appears.

2 In the layer outline, click the name of one or more layer properties containing the keyframes you want to keep at the same times.

3 Choose Edit Cut.

4 Move or stretch the layer duration bar to its new In and Out points.

5 Move the current-time indicator to the time at which the first keyframe appeared before you cut the keyframes.

6 Choose Edit Paste.

See also “Shortcuts for keyframes” on page 650 “Shortcuts for showing properties in the Timeline panel” on page 647 Copy a value from a layer property that contains no keyframes You can copy the current value of a layer property to another layer, even when the original layer contains no keyframes. This can save you the time of having to set up a property the same way on various layers.

1 In the Timeline panel, display the layer property containing the value you want to copy.

2 Click the name of the layer property to select it.

Anchor Point property selected

–  –  –

5 If the target layer contains keyframes, move the current-time indicator to the time where you want to paste the value. If the target layer does not contain keyframes, the new value applies to the entire duration of the layer.

6 Choose Edit Paste.

See also “Shortcuts for keyframes” on page 650 “Shortcuts for showing properties in the Timeline panel” on page 647 Change multiple keyframe values at once You can change the values of multiple keyframes on multiple layers at one time; however, all keyframes you select must belong to the same layer property. The way the values change depends on the method you use to make the

change:

• If you change a value numerically, all selected keyframes use the new value exactly. In other words, you make an absolute change. For example, if you select several Position keyframes on a motion path and numerically specify a Position value for one of them, all selected keyframes change to the same position value.

• If you change a value by dragging the underlined value, all selected keyframes change by the same amount. In other words, you make a relative change. For example, if you select several Position keyframes on a motion path and drag the underlined value for one of them, all selected keyframe values change by the same amount.

• If you change a value graphically in the Composition or Layer panel, all selected keyframes change using the difference between the old and new values, not the values themselves. In other words, you make a relative change.

For example, if you select several Position keyframes on a motion path and then drag one of them 10 pixels to the left, they all move 10 pixels to the left of their original positions.

You can also change the value of several layers at once in layer bar mode by parenting them.

1 Select the keyframes you want to change. All keyframes you select must be on the same property.

2 Change the value of any selected keyframe by one of the methods above. All other selected keyframes change accordingly.

See also “Work with parent and child layers” on page 158 “About animation, keyframes, and expressions” on page 183 “Shortcuts for keyframes” on page 650 “Shortcuts for showing properties in the Timeline panel” on page 647

–  –  –

When you select multiple keyframes in the Graph Editor, a free-transform bounding box appears.

1 Switch to the Graph Editor view and display the keyframes you want to adjust.

2 Using the Selection tool, do one of the following:

• To select keyframes, Shift-click the keyframes or drag to draw a marquee around the keyframes.

• To select all keyframes for a property, Alt-click (Windows) or Option-click (Mac OS) a segment between two keyframes.

3 Do any of the following:

• To move keyframes in time or value, position the pointer inside the bounding box and drag. Shift-drag to constrain the move horizontally or vertically.

• To move keyframes in time or value by scaling the bounding box, position the pointer on a bounding box handle.

When the pointer changes to a straight, double-sided arrow, drag the bounding box to a new size. Shift-drag to constrain the ratio of width to height. Ctrl-drag (Windows) or Command-drag (Mac OS) to scale around the bounding box’s anchor point. When dragging a corner handle, Alt-drag (Windows) or Option-drag (Mac OS) to move only that handle.

Scale by negative amounts to reverse the keyframes in time.

• To taper keyframe values vertically, Ctrl+Alt-drag (Windows) or Command+Option-drag (Mac OS). Tapering keyframe values allows you to reduce or expand the amplitude of a repeated animation.

• To move one side of the bounding box up or down, Ctrl+Alt+Shift-drag (Windows) or Command+Option+Shiftdrag (Mac OS).

• To move the bounding box’s anchor point, position the Selection tool over the anchor point until the tool changes to the Move Anchor Point tool, and then drag to position the anchor point.

–  –  –

Creating and modifying motion paths Work with motion paths When you animate spatial properties—including Position and Anchor Point properties, as well as effect control point properties—the motion is shown as a motion path. Position motion paths appear in the Composition panel;

Anchor Point and effect control point motion paths appear in the Layer panel. A motion path appears as a sequence of dots, where each dot marks the position of the layer at each frame. A box in the path marks the position of a keyframe.

Note: The density of dots between the boxes in a motion path indicates the layer’s relative speed. Dots close together indicate a lower speed; dots farther apart indicate a greater speed.

Motion paths are simply an alternative visual, spatial way of viewing and working with spatial properties and their keyframes, in addition to the ways that you work with properties in the Timeline panel. You can modify a motion path by changing an existing keyframe or adding a new keyframe. You can modify a motion path’s shape by changing the spatial interpolation methods for its keyframes.

Note: Right-click (Windows) or Command-click (Mac OS) a keyframe to open its context menu.

Using the Pen tool or Selection tool to edit keyframes for a spatial property in the Composition or Layer panel is similar to modifying a Bezier path for a mask or for a shape on a shape layer. (See “About paths” on page 313.) A motion path is less complex and generally easier to modify when you use fewer keyframes to describe the path.

You can use The Smoother to remove extraneous keyframes from a motion path.



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