If you utilize UltraLinq's Flash viewer, you may adjust the brightness and contrast for the images and clips of any exam.
To do so, begin by viewing the exam in question. With an image or clip loaded, click the "Adjust" button located above the full-size image.
This will load several slide bars that allow you to change the brightness, contrast, and playback speed (clips only). Simply adjust the slide bars as desired, and click anywhere outside of the area of the box when done making changes.
Adjust the slide bars will change the properties for each image or clip in the exam, but only for this instance of viewing. So the next time you view this exam, the images and clips will revert to the default.