Brightness and Contrast
To adapt brightness and contrast:
Click Diagnose in the menu bar.
Click Brightness Contrast 
.
Drag on a viewer:
horizontally: to change the contrast.
vertically: to change the brightness.
Right-click to stop the action.
Notes
When the brightness and contrast tool is used with grayscale images, the level and window values are updated accordingly.
Level and window values are shown in the bottom-left corner of the workspace.
Upon importing or capturing a 2D image, level and window values are automatically set. To disable this, go to the Image settings.
Alternatively:
Click on the SmartPanel™ Viewer tab 
.
Use the Brightness and Contrast sliders to adjust brightness and contrast.
Notes
To set level and window values, 
and enter values in the corresponding boxes.
Click Reset 
to set the brightness and contrast back to their default values.