how to correct, remove, retouch the dark under-eye rings, bags, wrinkles and circles with Gimp.

paint white over the dark under eye circles

Create a new transparent layer. Choose white as color to correct, remove and fix dark stains or under-eyes. Choose black as color to remove, retouch and fix bright stains. Paint with a paintbrush on the transparent layer over the spot or blemish that you wish to correct and retouch. Blur the retouching layer with Filters » Blur » Gaussian Blur. I used a value of 75x75 px to blur the layer in my image.

brighten the brightness of under eye rings

Set the layer mode of the retouching layer in the layers dialog to Overlay to retouch the underlying layer in the image.

Duplicate the original layer, move the copy to the top of all layers. Set the layer mode of the moved layer to Hue to keep the natural hue and colors of the picture. Duplicate the upper layer, set the layer mode of the duplicated layer to Saturation to keep the natural saturation of colors in the picture.

xoxo
aL

Read the complete tutorial, click here.

retouch eyes with Gimp

Select the white sclera of each eye with Gimp's selection tool lasso. Make the selection soft by using the Select » Feather dialog. I used a value of 5 px to make the selection in my image soft.

Reduce the saturation of previously selected white sclera with Tools » Colors » Hue + Saturation to make the eyes more bright, brighter and clearer. I used the following values to improve the eyes in my image: Hue: 0 ; Lightness: 60 ; Saturation: -70.

enhance lightness in iris of eyes

Select the iris of eyes with Gimp's selection tool lasso. Make the selection soft by using the Select » Feather dialog. I used a value of 5 px to make the selection in my image soft.

Enhance the brightness and saturation of the iris by using the Tools » Colors » Hue + Saturation dialog. I used the following values to improve the brightness in my image: Hue: 0 ; Lightness: 10 ; Saturation: 35.

xoxo
aL

Tutorial taken from Click here.

How to remove red-eye from your digital photos using GIMP

Select the regions that you want non-red, mainly iris of the eye. You could use a rectangular selection tool for this.
Now select Filters -> Enhance -> Red Eye Removal
and change the coloring as required. So simple.

xoxo
aL

More detailed help click here.