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You can also reapply this key to preserve a color that was made transparent by the first
application of the key. For example, if you are keying out a medium-blue screen, you
might lose some or all of a light-blue piece of clothing your subject is wearing. You can
bring back the light-blue color by applying another instance of the Linear Color Key and
choosing Keep This Color from the Key Operation menu.
A
B
C
D
E
A. Original image thumbnail B. Minus (-) eyedropper C. Key Color swatch D. Matching Tolerance
control E. Matching Softness control F. Thumbnail eyedropper G. Plus (+) eyedropper H. Preview
thumbnail I. View J. Key Color eyedropper K. Match Colors L. Key operation
To apply the Linear Color Key:
1 Select a layer as the source layer, and then choose Effect > Keying > Linear Color Key.
2 In the Effect Controls window, choose Key Colors from the Key Operation menu.
3 Choose a color space from the Match Colors menu. In most cases, use the default RGB
setting. If you're having trouble isolating the subject using one color space, try using a
different color space.
4 In the Effect Controls window, choose Final Output from the View menu. The view you
choose appears in the right thumbnail and in the Composition window. If you need to see
other results, work in one of the other views:
Source Only shows the original image without the key applied.
•
Matte Only shows the alpha channel matte. Use this view to check for holes in the trans-
•
parency. To fill undesired holes after you complete the keying process, see "Matte
Choker (PB only)" on page 211.
5 Select a key color in one of the following ways:
Select the Thumbnail eyedropper, and then click an appropriate area in the Compo-
•
sition window or the original image thumbnail.
Select the Key Color eyedropper, and then click an appropriate area in the Composition
•
or Layer window.
To preview transparency for different colors, select the Key Color eyedropper, hold
•
down the Alt key (Windows) or Option key (Mac OS), and move the cursor to different
areas in the Composition window or the original image thumbnail. The transparency of
the image in the Composition window changes as you move the cursor over different
colors or shades. Click to select the color.
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Applying Effects
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