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The Smudge tool evokes finger painting . With GIMP-2.10, 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.
You can find the Smudge tool in various ways :
through → → in the image menu,
by clicking on the tool icon:
in Toolbox,
or by pressing the S key on keyboard.
The Shift key places the smudge tool into straight line mode. Holding Shift while clicking the mouse will smudge in a straight line. Consecutive clicks will continue smudging in straight lines that originate from the end of the last line.
Using Ctrl with Shift, you can constrain the angle between two successive lines to vary by steps of 15°.
Normalt vises værktøjsindstillingerne i et vindue under værktøjskassen, så snart du aktiverer et værktøj. Hvis de ikke gør, kan du få adgang til dem fra billedmenulinjen via → → , som åbner indstillingsvinduet for det valgte værktøj.
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.
This option could be called "Smudge length" since it sets the length of the smudging effect in a stroke.
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.
Figur 14.108. An example of "No erasing" from the programmer
Without "No erasing effect"
With "No erasing effect"
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).
“No erasing effect” and “Flow” are new options in GIMP-2.10. Here are comments and examples from the programmer of these options in gimp-forum.net:
