Add a retro look to an image in GIMP 2.8

In this tutorial I show how to make a photo look vintage / retro with purple and pinkish tones in GIMP 2.8.

Tools used:
Colour balance
Levels & Channels
Layers & Layer Modes
Curves & Channels
GEGL / Vignette

GIMP is a free software and it can be downloaded from here: http://www.gimp.org/

My text tutorials for GIMP 2.8 can be found here: http://dinablaszczak.hubpages.com/_ytb101/