5.3. Color Picker

图 14.172. The Color Picker in the toolbox (eye dropper icon)

The Color Picker Tool is used to select a color on any image opened on your screen. By clicking a point on an image, you can change the active color to that which is located under the pointer. By default, the tool works on the active layer, but the Sample Merge option lets you grab the color as it is in the image, resulting of the combination of all layers. Only colors in visible layers are used. An Info window opens when you click on the image.

5.3.1. Activating the Tool

You can get to this tool in several ways :

• In the image menu through Tools → Color Picker.,

• by clicking the tool icon in Toolbox,

• by pressing the O keyboard shortcut,

• by pressing the Ctrl key while using a paint tool. The Color-picker dialog is not opened during this operation and the tool remains unchanged after releasing the key. Nevertheless, you can get information by using the Pointer window.

5.3.2. Key modifiers

Ctrl

Ctrl does nothing here. But, when using a paint tool, pressing Ctrl allows you to pick colors without having to switch to Color Picker tool.

Shift

If the Use info window option is not checked, pressing Shift key, opens the Color Picker Information window when you click on a pixel.

	注意
	The Pointer Information gives you the same information permanently. But be warned, it defaults to Sample merged.

5.3.3. Options

图 14.173. Color Picker Options

Normally, tool options are displayed in a window attached under the Toolbox as soon as you activate a tool. If they are not, you can access them from the image menu bar through Windows → Dockable Windows → Tool Options which opens the option window of the selected tool.

Sample Merged

When enabled, the Sample Merged checkbox will take color information as a composite from all the visible layers. Further information regarding Sample Merge is available in the glossary entry, Sample Merge.

Sample Average

The Radius slider adjusts the size of the square area that is used to determine an average color for the final selection. When you keep clicking the layer, the mouse pointer shows the size of the square or radius.

Pick Target (Ctrl)

• Pick Only

  The color of the selected pixel will be shown in an Information Dialog, but not otherwise used.

  Set Foreground Color

  The Foreground color, as shown in the Toolbox Color Area, will be set to the color of the pixel you click on.

  Set Background Color

  The Background color, as shown in the Toolbox Color Area, will be set to the color of the pixel you click on.

  Add to Palette

  When this option box is checked, the picked color is sent to the active color palette. See Palette Editor.

Use info window

When this option is checked, the information window is opened automatically. The Shift key allows you to toggle this possibility temporarily.

图 14.174. Color Picker Info Window