there was a question in Bugzilla [1] that is better discussed here.

Problem: A user wants to draw with the pencil or the ink tool using a tablet. The brush size should increase with the pressure: low pressure should result in a small brush size, high pressure result in a bigger brush size.

1. Make sure GIMP recognizes tablet pressure. You find some useful information in the thread [2] a few days ago, especially the posting of Jehan Pagès (thanks Jehan ;-) ). 2. in the Windows menu select 'Dockable Dialogs', then 'Paint Dynamics'. The 'Paint dynamics' dockable will open. 3. In the 'Paint dynamics' dockable list select 'Negative size pressure'. Right click on it, select 'Duplicate dynamics'. A copy of this dynamics will be created and opened in the 'Paint Dynamics Editor' dockable. 4. In the 'Paint Dynamics Editor' there's a textbox for the name of the Dynamics at the top. Enter a meaningful name, like 'Positive size pressure'. 5. Below that textbox is a listbox at the top. Choose 'Size'. This will show a diagram, showing the effect of the pressure on the brush size. Drag the ends of the descending red line to match the ascending gray line.
6. Save the settings for this Paint Dynamics.
7. In the Paint tool (Pencil, Paintbrush, Airbrush, etc). choose your new Paint Dynamics and start painting.

I hope this helps.
BTW is there a need to ship these Paint dynamics settings with GIMP?

Kind regards,


[1] https://bugzilla.gnome.org/show_bug.cgi?id=682351
[2] https://mail.gnome.org/archives/gimp-user-list/2012-September/msg00212.html
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