User guide

105
Creating a chroma key effect
Viewing and selecting your key colors
There are four ways of viewing and selecting the colors on which you want to
key. To switch between the views, you can click the appropriate button, or you
can use the following keyboard shortcuts:
Q for Output, W for Plot, E for Map,
and
R for Matte.
•
Output This is the default view when you first display the Custom
Chroma Keys
page. You can see the result of your chroma key effect in the
Preview Window. You can click and drag in the Preview Window to
select a rectangular area containing the colors on which you want to key. The
tracking rectangle stays visible until you let go of the mouse button. The
keyer controls are adjusted to reflect your selected key colors. You can also
add to the previously selected key color by holding down the
CTRL key and
selecting a new rectangular area of a similar shade.
•
Plot Click this to plot the colors and luminance values that are present in
the current frame of your clip. The
Luma Plot shows each luminance value
present in your image as a vertical line in the histogram. A longer line
indicates a higher amount of pixels in your image of that line’s luminance
value. When you adjust the keyer controls, you can see the visual
representation of your changes in the
Chroma Plot or Luma Plot:
Tracking rectangle
✐
✑
✒
✐ Luminance selector ✑ Saturation threshold
indicator
✒ Color selector