1. Select a clip in the timeline.

2. Position the playhead in the timeline so that your clip appears in the viewer.

3. Add a video effect to the clip from the Effects browser.

   You can add almost any kind of video clip effect, including the Color Correction effect. However, effects in the Keying and Masks categories in the Effects browser do not have the built-in effect masking tools described here.

4. If the Video inspector isn’t already open, do one of the following:

   • Choose Window > Show in Workspace > Inspector (or press Command-4).

   • Click the Inspector button on the right side of the toolbar.

5. Click the Video button at the top of the inspector.

6. In the Effects section of the Video inspector, add a shape mask or a color mask to the effect.

7. To add an additional mask to the effect, move the pointer over the effect name in the Video inspector and click the Apply Effect Masks button that appears to the right of the effect name.

   The new mask appears below the effect name in the Video inspector, with the blend mode to the right. By default, new shape masks appear at the top of the list in Add mode, and new color masks appear at the bottom of the list in Intersect mode.

   Note: You can rearrange the order of the masks within a given effect. For more information, see Reorder masks, below.

8. To change how a mask interacts with other masks applied to the effect, click the pop-up menu next to the mask name and choose a blend mode:

   • Add: Applies the effect to the area inside the mask shape selection. If two or more masks are set to Add, the masks are merged.

   • Subtract: Removes the effect from the area inside the mask shape, including areas that overlap with other masks.

   • Intersect: Applies the effect to any area inside the mask shape that overlaps with other masks set to either Add or Intersect.

   Note: At any time, you can invert all masks for a given effect. For more information, see Invert effect masks for a clip.

The order in which you apply shape and color masks can affect the final output. The Add, Subtract, and Intersect modes operate sequentially, starting at the top of the mask list in the Video inspector. By default, new shape masks appear at the top of the list in Add mode, and new color masks appear at the bottom of the list in Intersect mode. You can reorder masks to achieve the effect you want.

1. To apply two or more masks to an effect, follow steps 1 through 6 in Add, subtract, and intersect masks, above.

   The masks are listed below the effect name in the Video inspector.

2. To change the mask order, drag masks up or down in the list.