In
many contexts, you can click an eyedropper button
to activate
the eyedropper tool, or you can click a color swatch to open a color
picker. If you use the Adobe Color Picker, you can also activate
the eyedropper from the Adobe Color Picker dialog box.
If you click a gradient swatch for a shape layer’s stroke or fill, or click Edit Gradient in the Timeline panel, the Adobe Color Picker opens as the Gradient Editor, with additional controls for editing gradients included at the top of the dialog box.

Choose a color picker
Choose Edit > Preferences >
General (Windows) or After Effects > Preferences > General
(Mac OS), and do one of the following:To use the color picker provided by the operating system, select Use System Color Picker.
To use the Adobe Color Picker, deselect Use System Color Picker.
Select a color with the eyedropper toolTo select the color of a single pixel, click the pixel.
To sample the color average of a 5-pixel-by-5-pixel area, Ctrl-click (Windows) or Command-click (Mac OS) the area.
Press the Escape key to deselect the
eyedropper.
Select a color with the Adobe Color Picker
Edit a gradientA gradient is defined by color stops and opacity stops. Each stop has a location along the gradient and a value for color or opacity. The values between stops are interpolated. By default, the interpolation is linear, but you can drag the opacity midpoint or color midpoint between two stops to alter the interpolation.