GIMP Painter.

GIMP Paint Studio is "particularly useful with GIMP-Painter patch" says the GIMP Paint Studio PPA.

GIMP Painter adds some color blending and line smoothing features you can see in the video below (the video is quite old though):

Unfortunately, GIMP Painter is not a separate package but a whole patched GIMP. If you're using GIMP from the official Ubuntu repositories (Karmic, Lucid or Maverick), the installation is very easy.

Just copy/paste the following commands in a terminal:

sudo add-apt-repository ppa:mizuno-as/gimp-painter
sudo apt-get update
sudo apt-get upgrade

If you're using a newer GIMP version such as the latest stable version 2.6.11, you won't be able to use the above PPA because it has the same GIMP version as the official Ubuntu repositories (2.6.10 for Maverick).

You can however install it, either by purging the PPA, downgrading GIMP or the easiest way: manually download the GIMP packages and install them using a terminal.

To do this, download the following .deb files:

Ubuntu 10.10 Maverick Meerkat

32bit:

gimp-data



gimp



libgimp2.0



64bit:

gimp-data



gimp



libgimp2.0




Ubuntu 10.04 Lucid Lynx

32bit:

gimp-data



gimp



libgimp2.0



64bit:

gimp-data



gimp



libgimp2.0




To install the above packages, download them all in some folder, let's say the "gimp" folder in your home directory and then use the following commands to install it:

cd ~/gimp
sudo dpkg -i *.deb

Now GIMP with the GIMP Painter patch should be installed.

Make sure you don't upgrade GIMP (as well as gimp-data and libgimp2.0 or else you'll lose the GIMP Painter patch!

Important:

This will only work if you're using GIMP 2.6.11 and it won't work if you use GIMP 2.7.x (if you're using 2.7.x, the only way to install GIMP with the Painter patch is to purge the PPA from where you've installed GIMP 2.7.x!).