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My sister is moving from Windows and I just got her a new graphics tablet. However, the pressure sensitivity controls opacity rather than line thickness; she really needs this feature from Photoshop/Corel Painter.

Is there a way to toggle on or off the pressure affecting either line opacity or thickness?

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3 Answers 3

Make sure you have checked Pressure: Size in the Brush Dynamics section of the Toolbox:

enter image description here

If this still doesn't work, you probably haven't enabled the tablet. To do so, go to:

  • Edit → Preferences
  • Input Devices → Configure Extended Input Devices
  • Choose your device and set it to Screen mode
  • Save, close, and try again.
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On newer versions of Gimp the Brush Dynamics window will not look like that. Here is how it looks in Ubuntu 13.04:

enter image description here

If you click on the notepad to the right of "Pencil Generic copy", it will show the menu where you can select what pressure will do to the picture (opacity, size, etc.). But it is all disabled/greyed out. What you need to do is click on the crazy blue arrow, then click on the crazy blue arrow again, which will open the brush dynamics selection dialog. There you can select a brush and duplicate it. You will then be able to select the duplicate brush you just create, click on the notepad button, and then finally edit the brush dynamics as shown by htorque.

This has been tested in a Thinkpad X61 tablet running 13.04/raring and Gimp 2.8.4.

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I cannot find the way to duplicate a brush dynamic as you say. P.S. Ah, found it, the second smaller crazy blue arrow is below the list of all the other bigger blue crazy arrows. –  Janis Jun 26 at 19:37

If you do not see the items Pressure, Velocity and Random you need to open those fields by clicking on "Brush Dynamics". This will unfold the three checkbox fields as shown in the screenshot. It took me an hour to find this out.

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