Use the pop-up color palette in Final Cut Pro

Use the pop-up color palette to select a color from the spectrum of hues, saturation, and lightness. You can also select a grayscale value.

In Final Cut Pro, Control-click a color well, or click the adjacent downward arrow.
In the pop-up color palette, do one of the following:
- Select a color from the spectrum of hues, saturation, and lightness: Click in the top area.
- Select a grayscale value: Click in the bottom gradient.
As you move the pointer over either area, the pointer becomes an eyedropper, the column on the right displays the RGB and HSL values for the sampled colors, and two swatches above the RGB information display the current and sampled colors. As you sample in the spectrum, the selected object is updated in the viewer.

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Final Cut Pro X User Guide