Tự học iLife - p 21 docx

183 WORKING WITH iMOVIE ’09 Adding Special Effects to Movies chapter 10 44 How do I change the speed of action in the middle of a clip? You can change the speed only of an entire clip in a project. To adjust action in the middle of a clip, first select the action and then split the clip. 1 Click and drag to select only the action you want to change. 2 Click Edit. 3 Click Split Clip. iMovie divides the clip into new left, middle, and right clips. 4 Select the middle clip and follow the steps above to change the speed. iMovie saves the changes to the speed of the clip. ● You can click to play the movie with the adjusted speed. ● iMovie changes the length of the clip in the project to match the new speed. The clip lengthens if it is slowed down and shortens if it is sped up. 4 Click Done. 11 22 33 184 11 22 33 The clip is converted and the speed controls appear. 3 Click to reverse the direction of the clip ( changes to ). 1 Double-click a clip in your project. The Inspector opens. 2 Click Convert Entire Clip. iMovie must process a clip before it reverses the direction of the clip. Reverse a Clip You can reverse a clip to make action play backward. You can use this effect to add humor to your movie or to emphasize action in a scene by making it play back and forth. Reverse a Clip 185 WORKING WITH iMOVIE ’09 Adding Special Effects to Movies chapter 10 44 How do I make a clip play forward and then backward? You can duplicate a clip and then reverse the action in the second copy. 1 Click to select a clip. 2 Click Edit. 3 Click Copy. 4 Click Edit again and then click Paste. ● iMovie creates a second copy of the clip. 5 Select the second copy of the clip and follow the steps above to reverse the action. iMovie saves the changes to the direction of the clip. ● You can click to play your movie with the reversed clip. ● iMovie reverses the direction of the thumbnails in the project. 4 Click Done. 33 22 11 186 11 33 22 S T A B I L I Z E S T A B I L I Z E ANALYZE FOR STABILIZATION 1 Select a clip in the event browser. You can also select a clip in the project browser to stabilize it. 2 Click File. 3 Click Analyze for Stabilization. ● iMovie analyzes the clip and displays a progress bar. ● You can click Cancel to stop the stabilization analysis. Note: Stabilization is resource-intensive and takes time to complete. When analyzing a long video, you may want to let the process run overnight or while you are away from your computer. iMovie completes the analysis. ● Parts of the video where stabilization failed are marked with red squiggles. Stabilize a Clip iMovie can analyze the motion in a clip so that it can stabilize the action. This can often improve bumpy video shot from a moving vehicle, for example. Stabilize a Clip 187 WORKING WITH iMOVIE ’09 Adding Special Effects to Movies chapter 10 22 44 33 11 22 How do I automatically stabilize imported video from a camera? You can have iMovie automatically stabilize video during the import process. 1 Connect a camera to your Mac to import your video. For details, see Chapter 7. 2 In the import window, click Import. 3 In the dialog that appears, click Analyze for stabilization after import ( changes to ). 4 Click Import. iMovie analyzes the imported video for stabilization. ADD A STABILIZED CLIP 1 Click and drag to select an analyzed clip. 2 Click and drag the clip to your project. 188 33 iMovie plays the stabilized clip. ● As the clip plays, it is zoomed and shifted to smooth any jerky movement. iMovie adds the clip to your project. 3 Click to select the clip. 4 Press . Stabilize a Clip (continued) iMovie stabilizes the clip by analyzing the camera motion and then moving the video in the opposite direction to steady the action as it plays. The video is zoomed slightly so that the clip can be moved. Stabilize a Clip (continued) 189 WORKING WITH iMOVIE ’09 Adding Special Effects to Movies chapter 10 22 11 33 44 11 33 22 How do I limit the zooming that the stabilization feature applies? You can limit the amount of zoom that iMovie applies during stabilization to view more or less of the scene. 1 Double-click a stabilized clip in the project. 2 In the Inspector, click and drag the slider to control the amount of zoom. Drag it to the left to lessen the zoom and to the right to increase the zoom. The clip adjusts in the viewer to show the amount of zoom. 3 Click Done. The Inspector opens. 2 Click Smooth clip motion ( changes to ). iMovie turns off the stabilization for the clip. 3 Click Done. 4 Select the clip and press to view the change. TURN OFF STABILIZATION 1 Double-click a clip that has been stabilized. 190 44 11 22 33 3 Position your cursor over a thumbnail to preview the style of the theme. 4 Click a theme. 1 Click to open the titles browser. The titles browser opens. 2 Click Set Theme. Note: You can also set the theme when you create a project. See Chapter 8 for details. Apply a Theme to a Project You can add a theme to an iMovie project to automatically insert stylized graphics, transitions, and titles. You can edit the transitions and titles to further customize your project. Apply a Theme to a Project 191 WORKING WITH iMOVIE ’09 Adding Special Effects to Movies chapter 10 77 55 66 How do I edit a themed title? Editing a themed title is similar to editing a regular title. 1 Click here to select a title in your themed project. The title appears in the viewer. 2 Click here to select the title text. 3 Type a new title. Note: You cannot change the fonts in themed titles like you can in regular titles. For more about editing regular titles, see Chapter 8. 4 Click Done to apply the edit. iMovie applies the theme to your project. ● Transitions are added between some clips. ● Titles are added to some clips. 7 Click to preview the themed project. 5 Click to add theme-related transitions and titles ( changes to ). Note: Selecting this may replace transitions and titles already in your project. ● You can choose how to create the transitions ( change to ). 6 Click OK. 33 22 11 44 192 55 44 33 11 22 4 In the event browser, click and drag to select the clip you want to embed. 5 Click and drag the selection onto a clip in your project. 1 Click iMovie and then Preferences. 2 Click Show Advanced Tools ( changes to ). 3 Click to close the preferences. Add a Picture-In-Picture Effect You can embed a small version of a clip within another clip, known as a picture in picture, and have the clips play at the same time. This is useful when you want to present different perspectives of the same scene simultaneously or insert footage of someone commenting on the action. You must turn on Advanced Tools in the iMovie preferences to use the picture-in-picture effect. Add a Picture- In-Picture Effect . controls appear. 3 Click to reverse the direction of the clip ( changes to ). 1 Double-click a clip in your project. The Inspector opens. 2 Click Convert Entire Clip. iMovie must process a clip before. close the preferences. Add a Picture-In-Picture Effect You can embed a small version of a clip within another clip, known as a picture in picture, and have the clips play at the same time. This. see Chapter 8. 4 Click Done to apply the edit. iMovie applies the theme to your project. ● Transitions are added between some clips. ● Titles are added to some clips. 7 Click to preview