Greetings, Bjarne --
There is a BrightnessContrastCommand (that's the name of it) that you will want. Once you set it like this:
BrightnessContrastCommand cmd = new BrightnessContrastCommand(Brightness, Contrast);
you can then call it with the WebImageViewer like this:
WebImageViewer.ApplyCommand(cmd);
Elaine McNealy
Developer Support Supervisor
Atalasoft, Inc.