To access the editing tools, open an image and then click the Edit File toolbar button (the palette icon).
gThumb provides a Red Eye Removal tool. To remove a red eye, position the mouse pointer over the red eye and click on it. gThumb will attempt to remove the red region and replace it with a more natural-looking gray region. If the results do not look correct, press Escape and click on the Undo item.
This tool works best when there is a high color contrast between the red eye and the surrounding facial area. It does not work well for "orange eye" sometimes seen in photos of children, or if the surrounding skin has a reddish tinge. This tool could use improvement - if you are fiendishly clever, love matrix algebra and open source software, please
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