This dialog box offers settings for the HDR acquisition process.
Opening the dialog box
You can open this dialog box, for example, via the Camera Control tool window. In the tool window's toolbar, click the Acquisition Settings 
button. Select the Acquisition > HDR option in the tree view.
See also
Overview - Acquisition Settings
HDR parameters
In the HDR parameters group, you can view and change the current settings for acquiring HDR images. Your changes apply for the next HDR image that you acquire.
Exposure range increase
In the Exposure range increase field, you can see the factor by which the minimal exposure time is multiplied to determine the maximal exposure time. The exposure range is determined in this way.
Example: If the minimal exposure time is 4 ms and a factor of 4 is selected, the maximal exposure time is 16 ms.
If you want to change the value, you can do so by using the slide control or be entering a value in the field and pressing the [Enter] key.
Number of frames
In the Number of frames field, you can see how many images should be acquired for the HDR image. For a wider exposure range, more images need to be acquired than for a narrower exposure range. This is because otherwise the exposure time between the images is too large.
If you want to change the value, you can do so by using the slide control or be entering a value in the field and pressing the [Enter] key.
Output rendering
In the Output rendering field, choose an algorithm for displaying the HDR image on your monitor. This step is necessary because an HDR image contains significantly more intensity values than can be displayed on the monitor. Because of this, the histogram for the HDR image needs to be compressed for displaying on the monitor. This procedure is called "tone-mapping". You can choose from a number of algorithms for this compression. The algorithms are described briefly below.
Note: The same algorithm can have significantly different effects depending on the images. Because of this, we cannot give general recommendations for using the algorithms. So, try various algorithms in order to find the most suitable one for your images. You need to acquire a new HDR image each time that you want to see the changes.
Linear
Select the Linear entry if you want to keep the contrast original. If you want to measure the intensity on your images, you must choose this entry because all other algorithms change the contrast.
Gamma (2) or Gamma (4)
Select the Gamma (2) or Gamma (4) entry if you want to make the entire image brighter and are especially interested in details in the dark image segments. The Gamma (4) algorithm brightens the image even more than Gamma (2) and can be used for making further image details visible. However, intensity values can shift in the image when using the Gamma (4) algorithm.
Logarithmic (2), Logarithmic (5) or Logarithmic(10)
Select the Logarithmic (2), Logarithmic (5) or Logarithmic (10) entries if you want to make the entire image brighter and are particularly interested in the dark image segments. As opposed to the Gamma algorithm, the bright image segments are brightened less intensely with the Logarithmic algorithm.
Drago
Select the Drago option if you want to make the entire image darker. Brighter image segments are more compressed.
Contrast shadow
Select the Contrast shadow entry if you want the contrast particularly in the dark segments of the image to be increased.
Contrast shadow and highlight
Select the Contrast shadow and highlight entry if you want the contrast in both the dark and bright segments of the image to be increased.
Auto contrast after HDR
Select the Auto contrast after HDR check box if you want the contrast for all HDR images to be automatically strengthened. In this case your software will automatically ascertain which are the image's smallest and greatest intensity values. The range between the smallest and greatest intensity values will be divided up into 256 parts and displayed on your monitor.
This function is the same than the Auto Contrast option that is part of the Adjust Display tool window. If this function is chosen universally for all images, it also applies for HDR images. That means that it is irrelevant whether or not the Auto contrast after HDR check box is also selected here. Further information to the Auto Contrast option can be found here.
Automatic HDR preview
Select the Automatic HDR preview check box, if an HDR image should be acquired and shown every time that the exposure range is automatically determined. You can then check the result before deciding whether to change settings or, alternatively, to determine the exposure range manually.
Restoring default settings
Click the Default button to restore the default settings.
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