When keying transparencies, the transparency is sometimes either not visible enough or too prominent in the final composite. You can use patches to lighten or darken transparencies.

To adjust a transparency using a patch:

1. Use the basic keying technique to get the transparency as soft as possible.
2. Sample a patch in the transparency. See Adding a Patch.
3. View the final composite by displaying the CurResult view.
4. Do one of the following:
   • To lighten the transparency, set the Colour of the patch to 0 and the Opacity to 100, then lower the Opacity.
   • To darken the transparency, set the Colour of the patch to 100 and the Opacity to 0, then raise the Opacity.