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Chapter 7. Getting Creative with Keys > Extreme Contrast for Image Separation

Extreme Contrast for Image Separation

One of the most common techniques for separating parts of an image to reveal only the desired portion is to use a luminance key. A luminance key works with the difference in video level, or contrast, of the clip's signal. You can set your key to either drop out the lightest or brightest portion of your clip or switch it to drop out the darkest portions of the clip first. For example, let's take the black-and-white logo shown in Figure 7.3 (a white image over a black background) and see what happens when you key out different luminance values of that clip:

1.
Place any video clip (original source image) you want for the background on Video Track 1.

2.
Place the logo/graphic clip on Video Track 2 above the original source clip.

3.
Click the clip in Video Track 2 to select it.

4.
Click Setup next to Transparency in the Effect Controls window.


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