Brightness and contrast in Scan Control app

Controls for adjusting apparent image brightness and contrast on screen are given with the Range selection menu in the Palette section of the View toolbar.

Palette gives control over how the image is displayed on screen, without any changes to image data. This is necessary because human vision is limited in the number of grayscale levels it can perceive. Whereas image data may contain 256 (8-bit) or 65,536 (16-bit) gray levels, human vision is