Apple Color 1.5 - Manual (Page 263)

To use the eyedropper to pull a secondary key
1 Click the eyedropper.
The eyedropper becomes highlighted, and crosshairs appear superimposed over the
image in the preview and broadcast monitors. You use these crosshairs to sample the
HSL values from pixels in the image.
2 Move the mouse to position the crosshairs on a pixel with the color you want to key on,
then click once to sample color from a single pixel.
The crosshairs disappear, and the HSL controls are adjusted to include the sampled values
in order to create the keyed matte. In addition, the Enabled button turns on automatically
(which turns on the effect of the secondary operation in that tab). The Previews tab
becomes selected in the middle of the Secondaries room, showing the keyed matte that’s
being created by the HSL qualifiers. (For more information, see
Controls in the Previews
Tab .)
Once you’ve created the keyed matte, the next step is to use the color correction controls
at the top of the Secondaries room to actually make the correction. For more information,
see
The Primary In Room .
263 Chapter 10 The Secondaries Room