There's a pre-fab redeye reduction filter in GIMP that works pretty well. Here's how to use it.
1. Open the image with the red eye issue.
2. Click the rectangle select tool. You’re going to select the area of just the eyes. You don’t have to do this but if there is red anywhere else in the photo, you risk having that turn darker too unless you select just the eye portion.
Draw a box around the eyes.
3. Choose Filters > Enhance > Red Eye Removal.
In the window that appears, check to see in the preview area if the red is still visible. If not you're fine; if so you need to increase the tolerance, i.e. the amount of color similar to red that’s changed.
If the eyes are red, drag the slider bar to the right. Stop when you see that in the preview area the eyes are now dark.
4. Click OK.
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