Using Masks and Layers—Painting, Filling, and Color Tools - GIMP 2.6 for Photographers: Image Editing with Open Source Software - page 304

After the pictures are imported, the main FDRTools window will display
the opened files. The program creates a new project. On the left next to the
preview images you will find three buttons: Prepare , Edit , and Render .
Click Prepare . The program prepares the images for further editing, as you
will see in the progress bar in the Progress window. The preparation takes
some time, but in the long run it saves time.
Step 2: Automatic Alignment
After the Prepare function has
finished processing, click the
Edit button. The main window
changes its appearance. Again the
program processes the images
automatically and aligns them
to each other. The HDR Image
Inspector at the bottom displays
the first preview of the merged
HDR image.
A small green box next to
the Include button indicates that
all three images have been linked
together. This means that the HDR
image will be processed with all
the tagged images. You can take
out or add an image simply by
clicking on the Include button.
Figure 3.120
The main window with the opened and already aligned images. The Navigator is
depicting the HDR image, corresponding to the actual settings.