### 3.16. Smudge

The Smudge tool evokes finger painting. It works in two ways:

- If the Flow option is set to 0.00 (default), the Smudge tool uses the current brush to smudge colors on the active layer or a selection. It takes color in passing and uses it to mix it to the next colors it meets.

- When the Flow option is more than 0.00, the Smudge tool works as a brush using the foreground color of the toolbox and blend it with the underlying color.

#### 3.16.1. Activating the Tool

There are different possibilities to activate the tool:

- From the main menu: Tools → Paint Tools → Smudge.

- By clicking the tool icon in the Toolbox.

- By pressing the S keyboard shortcut.

#### 3.16.2. Key modifiers

Shift

  The Shift key places the smudge tool into straight line mode. Holding Shift while clicking the mouse LeftButton will smudge in a straight line. Consecutive clicks will continue smudging in straight lines that originate from the end of the last line.

  Figure 14.81. Smudge tool

  Shift click and drag to create line

Ctrl

  Using Ctrl with Shift, you can constrain the angle between two successive lines to vary by steps of 15°.

#### 3.16.3. Options

Figure 14.82. Tool Options Dialog

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 main menu through Windows → Dockable Windows → Tool Options which opens the option window of the selected tool. The available tool options can also be accessed by double clicking the corresponding tool icon in the Toolbox.

Opacity, Brush, Size, Aspect ratio, Angle, Spacing, Hardness, Force, Dynamics, Dynamics Options, Apply Jitter, Smooth stroke, Lock brush to view, Expand Layers
  See the Common Paint Tool Options for a description of tool options that apply to many or all paint tools.
Hard edge

  This option gives a hard contour to the smudged area.

No erasing effect

  If smudging will decrease alpha of some pixels; this alpha is not decreased if this option is checked, and so pixels are not erased. This is useful to fill a gap between two color areas.

  Figure 14.83. An example of "No erasing"

  Without "No erasing effect"

  With "No erasing effect"

Sample merged

  If you enable this option, sampling is not calculated only from the values of the active layer, but from all visible layers.

  For more information, see the Glossary entry.

Rate

  This option could be called "Smudge length" since it sets the length of the smudging effect in a stroke.

  Figure 14.84. Rate example

  1: Rate=20 2: Rate=60 3: Rate=90

Flow

  We already saw the different behavior of the “Flow” option when it is set to 0.00 (works as the original Smudge tool) and set to more than 0.00 (uses the foreground color for smudging).

Here are comments and examples for the “No erasing effect” and “Flow” options from gimp-forum.net:

3.15. Blur/Sharpen |  | 3.17. Dodge/Burn

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