Using Masks and Layers—Painting, Filling, and Color Tools - GIMP 2.6 for Photographers: Image Editing with Open Source Software - page 305

Step 3: Creating the HDR Image

The next step is to create the HDR
image. Click the HDRI Creation
button in the main window.
In the program window, the
histogram showing the default
values for the HDR image opens.
You also see the histogram for
each individual image. You can
choose between two buttons,
Auto and Exif . Auto processes the
image using the image data from
the program. Exif processes the
image according to the attached
Exif files that have been attached
by the camera. In this example,
however, only Auto is active.
In the histogram to the right
of each of the preview images, you
can apply gradation curves. Slide
the dots on the lines by selecting
them with the mouse. You can
also apply new dots by clicking on
the curve with the mouse. A click
on the Defaults button resets the
settings to the default values.
By default, the HDR Image
Inspector tab in the Navigator
window is initially active. You can
switch to the Tone Mapped Image
tab to view the brightness and
color rendering in the finished LDR
image.
When the HDR Image
Inspector tab is active, you can click
the Auto button. This option allows you to adapt the rendition of your image
automatically to the settings of your monitor. Next to it you will find a slider
that corresponds to the big histogram of the HDR image in the main window.
With it you can readjust the brightness of the HDR image.
The actual customization of the image for the exercise will take place in
the following step: Tone Mapping (the second button from the right at the top
of the main window).

Figure 3.121
The program window after clicking the HDRI Creation button.