Curves « Shapes « GIMP Tutorials

1. The Curves Tool    inphotos.org

2. Drawing Smooth Curves with Gimp    merit.oryo.us

To start with, create a new image on a white background. In the main Gimp toolbox, select the Path tool. On the image, place anchor points more or less as shown below. Note that the anchor points will automatically be joined by lines and to close the path, you need to hold down on the CTRL key as you click on the first anchor you laid.

3. The Gimp - Photo Editing Guide - Tutorials: Correct Color Cast, Using Levels and Curves    gimp-land.info