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Click the Key Color swatch to select a color from the specified color space.
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The selected color becomes transparent.
Note: The eyedropper tools move the sliders accordingly. Use the sliders in steps 6 and 7 to
fine-tune the keying results.
6 Adjust matching tolerance in one of the following ways:
Select the Plus (+) or the Minus (-) eyedropper, and then click a color in the left
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thumbnail. The Plus eyedropper adds the specified color to the key color range,
increasing the matching tolerance and the level of transparency. The Minus eyedropper
subtracts the specified color from the key color range, decreasing the matching
tolerance and the level of transparency.
Drag the matching tolerance slider. A value of 0 makes the entire image opaque; a value
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of 100 makes the entire image transparent.
7 Drag the Matching Softness slider bar to soften the matching tolerance by tapering the
tolerance value. Typically, values under 20% produce the best results.
8 Before closing the Effect Controls window, make sure that you have selected Final
Output from the View menu to ensure that After Effects renders the transparency.
To preserve a color after applying the Linear Color Key:
1 In the Effect Controls or Timeline window, turn off any current instances of keys or
matte tools by deselecting the Effect option to the left of the key name or tool name. This
displays the original image in the Composition window so that you can select a color to
preserve.
2 Choose Effect > Keying > Linear Color Key. A second set of Linear Color Key controls
appears in the Effect Controls window below the first set.
3 In the Effect Controls window, choose Keep Colors from the Key Operation menu.
4 Select the color you want to keep.
5 In the first application of the Linear Color Key, choose Final Output from the View menu
in the Effect Controls window, and then turn other instances of the Linear Color Key back
on to examine the transparency. You may need to adjust colors or reapply the key a third
time to find the results you need.
Luma Key
This key keys out all the regions of a layer with a specified luminance or brightness. The
layer's quality setting does not influence the Luma Key effect.
Original footage with a light background (left); light background keyed out and replaced with a color
(right)
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