Tự học iLife - p 20 docx

173 WORKING WITH iMOVIE ’09 Adding Audio to Movies chapter 9 11 33 How do I remove a beat marker? Follow these steps: 1 Click and drag the vertical line representing the beat marker outside the Clip Trimmer. iMovie deletes the beat marker. ● You can also -click the waveform and then click Remove All Beat Markers to remove them all. ● iMovie adds a beat marker to the audio clip, which appears as a vertical white line in the waveform. ● If the audio overlays a clip, iMovie also splits the clip at the beat marker. This allows you to easily replace content between beats in your project. You can move your cursor across the waveform to find the beats. 3 Click and drag to a beat in the song. ● You can also click to play the song and press to add beat markers as it plays. 174 22 66 33 44 55 1 Set beat markers in a song in your project. See “Add a Beat Marker” for details. ● In this example, beat markers have been added to the background music. 2 Click View and select Snap to Beats if the setting is not already checked. 3 Select a video clip to add. Make sure it is longer than the duration between beats. Note: For more about adding clips to a project, see Chapter 8. 4 Click and drag the selection to add it to the end of the project. iMovie adds the clip to the project. ● The clip is truncated to fit between the next two beat markers. 5 Click to open the photos browser. 6 Click and drag a photo to add it to the end of the project. Synchronize Content to Beats After you add beat markers to the beats in your song, you can easily synchronize your clips to play between the markers. When the snap-to-beats setting is turned on, iMovie automatically trims clips and still photos to fit between the next two markers. Synchronize Content to Beats 175 WORKING WITH iMOVIE ’09 Adding Audio to Movies chapter 9 44 33 22 11 77 How do I change the part of the clip that appears between the beat markers? When iMovie shortens a clip to fit it between beats, it trims from the end of the clip. In the precision editor, you can shift your video so that a different part of the clip appears. 1 Position your cursor over the clip you want to edit. 2 Click and click Precision Editor in the menu that appears. The precision editor opens. 3 Click and drag the clip to the left to display a different part. 4 Click Done to save the change. iMovie adds a still photo to the project. ● The photo is shown for the duration between the next two beat markers. For more about adding still photos to a project, see Chapter 8. 7 Click to preview the project. Because the content was snapped to the beats as it was added, the transitions match the rhythm of the background music. 176 22 66 55 11 44 7 ● You can click to turn off voice enhancement ( changes to ), which can electronically smooth your voice. ● You can click to play project audio as you record ( changes to ). Because your microphone can pick up this sound, you need to wear headphones if choosing this option. 6 Click a clip at the point where you want to start the voiceover. 1 Click to open the voiceover settings. 2 Click here to select a microphone. 3 Speak into the microphone to adjust the recording levels. 4 As you speak, click and drag the slider so that your voice generates a strong green signal in the meter without turning the meter red. 5 You can click and drag the slider to control noise reduction, which can reduce background noise. Record a Voiceover You can add voiceover audio using a built-in or external microphone on your Mac. You record a voiceover within iMovie as your project plays. The recording is then added to your project. Record a Voiceover 177 WORKING WITH iMOVIE ’09 Adding Audio to Movies chapter 9 QUIET QUIET PLEASE PLEASE QUIET PLEASE 99 How do I mute the audio of a clip? Select the clip in the project, click Edit, and then click Mute Clip. iMovie turns off the sound for that clip. You can mute video clips and audio clips this way. For more about changing the volume in your project, see “Adjust Volume.” How do I add only the sound from a video clip, and not the video itself, to my project? After selecting a video clip in the event browser, click and drag the selection onto an existing clip in the project browser. Click Audio Only from the menu that appears. iMovie adds the audio, which appears as a green icon in the project. ● iMovie adds the voiceover to your project as a purple icon. 9 Click to close the settings. ● You can click to play the project. Note: To change the volume of the voiceover, see “Adjust Volume.” iMovie counts down from three and then starts recording. 7 Speak into the microphone to create your voiceover. ● iMovie displays red where it has recorded in the project. 8 Click anywhere in the workspace to stop recording. 178 11 22 44 33 1 Double-click a video clip in your project. The Inspector opens with the clip adjustments showing. 2 Click None. Add a Video Effect to a Clip You can add a video effect to a clip in your project to change its color or lighting. iMovie’s effects allow you to quickly add an old-fashioned look, make your subjects glow, or add a shadowed vignette. Add a Video Effect to a Clip The Choose Video Effect panel appears. ● The None effect is selected. 3 Position your cursor over a video effect. ● iMovie previews the effect in the viewer. 4 Click an effect to apply it. This example shows the Heat Wave effect, which brightens and increases the contrast in a clip. ● You can click Cancel to close the panel without applying the effect. 179 chapter 10 WORKING WITH iMOVIE ’09 Adding Special Effects to Movies 55 How do I turn off a video effect? Follow these steps: 1 Double-click a video clip in your project to open the Inspector. 2 Click the Video Effect button. It will be labeled with the currently applied effect. 3 In the Choose Video Effect panel, click None to turn off the effect. The Inspector appears. 5 Click Done to close the Inspector and finish applying the effect. ● You can click to preview the video. 22 33 180 11 33 44 55 22 3 Click and drag the Exposure slider to adjust the shadows and highlights. 4 Click and drag the Brightness slider to change the overall lighting. 5 Click and drag the Contrast slider to adjust the balance of the light and dark tones. 1 Double-click a video clip in your project to open the Inspector. 2 Click Video. iMovie displays the color and lighting settings. Adjust Color and Lighting in a Clip You can use video settings to boost or dampen colors, brighten or dim lighting, and make other adjustments in your project. This can help you improve a poorly shot clip or add special visual effects to establish the mood in your movie. Adjust Color and Lighting in a Clip 181 WORKING WITH iMOVIE ’09 Adding Special Effects to Movies chapter 10 66 88 77 What are the Levels adjustments? In the Video adjustments panel, Levels allow you to adjust dark and light tones in a clip more precisely. ● The Levels graph shows a color histogram that represents the distribution of colors in the clip. Darker colors are on the right and lighter colors are on the left. 1 You can click and drag the left slider to the right to boost the darker tones. 2 You can click and drag the right slider to the left to boost the lighter tones. Moving the left and right sliders toward the middle slightly can often improve the look of a clip by improving the color range. iMovie applies the adjustments to the clip. ● You can click to preview the video. 6 Click and drag the Saturation slider to change the color intensity. You can drag the Saturation slider to the right to make colors richer or to the left to remove color. 7 Click a color that should be pure white or gray color in the viewer. ● iMovie adjusts the white point to remove any color cast that may be present. 8 Click Done. 22 11 182 22 11 33 SLOW SLOW SLOW SLOW FAST FAST FAST FAST Frames / sec Frames / sec Frames / sec The clip is converted and the speed controls appear. 3 Click and drag the slider to adjust the speed of the clip. Click and drag to the left to slow the clip down or to the right to speed it up. 1 Double-click a clip in your project. The Inspector opens. 2 Click Convert Entire Clip. iMovie must process a clip before it makes changes to the speed. Adjust the Speed of a Clip You can speed up or slow down a clip to emphasize the action occurring. You can boost the speed up to eight times the original rate or slow it down to one eighth the original rate. Adjust the Speed of a Clip . Double-click a clip in your project. The Inspector opens. 2 Click Convert Entire Clip. iMovie must process a clip before it makes changes to the speed. Adjust the Speed of a Clip You can speed. appears. The precision editor opens. 3 Click and drag the clip to the left to display a different part. 4 Click Done to save the change. iMovie adds a still photo to the project. ● The photo. Double-click a video clip in your project. The Inspector opens with the clip adjustments showing. 2 Click None. Add a Video Effect to a Clip You can add a video effect to a clip in your project