Add transitions between color corrections in Final Cut Pro

The most powerful and accurate way to change a color correction over time is to use keyframes to animate the changes. However, there may be times when you want to use a transition instead. For example, if you want a scene to gradually highlight the face of an actor, you could use a transition to dissolve between the original clip and a second instance of the clip that has a shape mask around the face and a color correction that darkens the image outside of the mask.

In Final Cut Pro, temporarily switch to the Blade tool by holding down the B key.
In the timeline, click a video clip at the point where you want to change between color corrections.
The clip splits into two clips.
Apply a different color correction to each clip.
You can also leave one clip uncorrected and apply a color correction to the other. The color correction could be an exaggerated tint, an exposure change, or any other noticeable adjustment.
Select the edit point between the two clips, then press Command-T to insert a cross dissolve.

When you play the clip, one color correction dissolves into the other as the edit point is passed.

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Final Cut Pro User Guide

Add transitions between color corrections in Final Cut Pro