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Chapter 13. Superimposing Clips > Previewing Any Key

Previewing Any Key

In the Transparency Settings dialog box, a sample image helps you analyze the effectiveness of the key. However, previewing the keyed image against the background image isn’t always the best way to evaluate your settings. It can be difficult to discern pixels and identify transparent areas. For this reason, the preview includes several options to make your adjustments easier to perform.

To preview any key type:

1.
In the Transparency Settings dialog box, choose how you want to preview the key by clicking one of the icons below the sample frame:

Black/White to fill the transparent areas of a clip with black; click it again to see transparent areas as white (Figure 13.18).

Figure 13.18. You can view the transparent areas in black or white...


Checkerboard to fill the transparent areas of the clip with a checkerboard pattern (Figure 13.19).

Figure 13.19. ...or in a checkerboard pattern...


Peel to fill the transparent areas of the clip with the actual background image (Figure 13.20).

Figure 13.20. ...or display the underlying video image.


The currently selected preview option icon appears underlined.

2.
To more closely evaluate the effectiveness of the key, select from the icons below the right side of the sample frame (Figure 13.21):

Figure 13.21. Use these tools to take a closer look at the key or view it in the program view.


Zoom tool click the sample frame to view an area in more detail; -click (Mac) or -click (Windows) to zoom out.

Hand tool drag in the sample frame to view different areas of the zoomed sample.

Collapse (in the Mac OS only) click to preview the key effect in the program view of the Monitor window; click again to preview the effect in the Transparency Settings dialog box (Figure 13.22).

Figure 13.22. Click the collapse button to preview the key in the program view of the Monitor window.


3.
To view the effectiveness of the key at different points in the clip, drag the slider below the sample frame (Figure 13.23).

Figure 13.23. Drag the slider below the sample to view the key at different points in the clip.


4.
Adjust the options for the currently selected key type, and repeat steps 1 through 3 as needed.

5.
Click OK to apply the key and close the Transparency Settings dialog box.


PREVIEW

                                                                          

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