User Manual

324 | CHAPTER 17
8. Click the Split Screen View button ( ) on the Video Preview window to restore the video effects. The Video Preview
window shows the result of the Chroma Keyer plug-in.
When a subject is filmed against a solid colored background in a studio, you can key out the background color using the Mask
Generator or the Chroma Keyer plug-in. You can select a wider range of colors using the Chroma Keyer plug-in, making it the
perfect tool for less-than-perfect blue screens.
This procedure selects a small range of colors to use as a key. In the example above, the blue sky around the dome is far from
uniform and it would be difficult to key it out with a traditional blue screen key. The color is uniform enough, however, that a range
of blues can be selected directly from the preview image. Use the controls at the bottom of the dialog box to determine the
sensitivity of the colors selected. Since the filter selects a range of colors, it is a good idea to try to select a relatively small range of
similar colors. Drawing a color selection area that spans both blue and red colors would make very large sections of an overlay
transparent.
Tip: It is possible to use multiple Chroma Keyer plug-ins on a single event, keying out the blues with one and the reds with the other,
without keying out any colors between blue and red.