Removing redeye used to be a major requirement for digital photographers, but these days newer sophisticated cameras can minimise it when you take the picture. But for those of you who want to have a go, in common with many image manipulation there's a Redeye removal tool in Gimphoto..
For this task, we'll use the picture of two young children.
First of all open the 'twokids' image.
Next, as with the cloning task, you should zoom in on the image to help you work with the detail.
Zoom in on the girl's face as shown, using the zoom tool.
Step 2 - Select the eye pupil 
This is done by choosing the Elipse selection tool (arrowed) and making sure that in the Tool Options dialogue the elipse is set to Feather, with a radius of around 2 to 4 pixels (highlighted by the red box). This will give the selection a 'soft' edge.
Once selected, just use the menu option PHOTO > RED EYE REMOVAL. Thi will bring up the dialogue box (see left).
The Threshold setting slider will at be set at the mid point. You might want to change it up or down.
To see the effect more clearly, use the dialogue box's own zoom in and out buttons.
Once you are happy, click OK to set.