Eyedropper

The Eyedropper tool lets selecting a color from an image. Press I to quickly access this tool.

A color selected with a mouse-click is shown as the current color in the Color palette. If you move a cursor holding down the Eyedropper tool you can see how the current color dynamically changes. Moving the Eyedropper with the pressed Shift-key averages out colors along all pixels in the cursor's path.

Adjust the tool's options in a popup menu which shows when right-clicking on the image or in the Settings Panel.