fotox

Fotox is a free open-source Linux program for improving image files made with a digital camera.
Most capabilities are shown below, and more examples can be seen at fotox gallery.

The GUI is available in English, German, and Spanish.
An English user guide (PDF) is available here.

To download Fotox, visit the download page
This is the latest version, installed from source using a simple procedure.

For Ubuntu (Gutsy) package, go to this link
For OpenSuse package, go to this link and search for "fotox"
These packages are created by volunteers working for their respective Linux distros.
Depending on when they were built, they may not have every capability described below.

Click on any of the following images to see a bigger image.
(use "open in new window" to get scroll bars if image is bigger than screen)

Navigation

View directory of images as pages of thumbnails.
Click thumbnail to get full size image to view or edit.

Tune

Change brightness, contrast, color.
(compare the left birds)

Change brightness distribution.
Darken bright areas and lighten dark areas.

Area Tuning (v.36)

The airplane shadows have been lightened
without affecting the terraine shadows.

The bird on the right has been color-enhanced
and the one of the left has not been changed.

The building on the right has been lightened up.

Tune - defog

The Shanghai haze has been cleared.

HDR (high dynamic range) photography

The lower image is a composite of the upper two.
Brighter areas were taken mostly from the darker image,
and darker areas mostly from the brighter image.
Color and contrast were also adjusted afterwards.