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683Final Cut Pro User Guide
To invert the mask selection, see Invert effect masks in Final Cut Pro.
7. Add a shape mask to the same color correction.
Both masks appear in a list at the bottom of the Color inspector.
By default, the shape mask appears at the top of the list, set to the Add blend mode.
The color mask’s blend mode is changed to Intersect. (In Intersect mode, only the area
inside the mask shape that overlaps with other mask shapes is affected.)
8. Click the Shape Mask Onscreen Controls button so that the onscreen controls
appear in the viewer.
9. Adjust the shape mask onscreen controls to isolate the area you want to correct (in this
example, the dark gray tones of the first car).
The alpha channel in the viewer shows the isolated area only.