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| Create footage. |
| The power of Real-Time preview is best witnessed on areas of the Timeline that contain footage that has several effects applied to it, or footage superimposed with an image that has several effects applied to it. Try this test with a piece of your own footage. First, add it to the Timeline. Then, import an image file, preferably one with an alpha channel, and place it in a superimpose track (Video 2 and higher) above the footage. Next, add at least three effects to the superimposed footage. In this example, we imported a Photoshop file with an alpha channel. To this clip, we added and set keyframes for three computation-intensive effects: Basic 3D, Drop Shadow, and Transform. |
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| Generate a normal preview. |
| To see the difference between a normal preview and a Real-Time preview, first generate a normal preview. Isolate the section of the Timeline that contains the clip you created in the previous step by defining a work area that encompasses that section. Save the project, and press Enter. Note that, depending upon processor speed and other system factors, you are prompted to wait--possibly for several minutes--while the preview is rendered. Before rendering is complete, click Stop in the Building Preview window to stop rendering. |
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| Generate a Real-Time preview. |
| Now, contrast the time it takes to generate a Real-Time preview. Make sure that the same section of the Timeline is isolated, as you set up in the previous step. Choose Project > Project Settings > Keyframe and Rendering. In Windows, select Real-Time Preview. In Mac OS, choose To Screen from the Preview menu. Click OK, and press Enter. The footage and the superimposed clip with the effects fully rendered appear immediately. |
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| Premiere dynamically adjusts video quality and frame rate as it previews in real-time. When Premiere performs a real-time preview on a system with inadequate resources, or on a particularly complex section of the Timeline, the preview quality degrades gracefully. In this instance, fewer frames are played and the video drops to draft quality. |
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