User`s manual

Chapter 2: Getting Started – Basic Imaging Functions
2-3
Imaging Display Tools: Black Level, White Level,
Gamma Setting with B/W/G, Linear, Log, and Equalize options
To adjust any of these settings, place the cursor on the slider. Click and hold down the
left mouse button while dragging the slider to a new setting. As the slider is moved along
the scale, the image display is updated, along with the change in numeric value. The
arrows above and below the scale bars can also be clicked to change the settings in single
unit increments, or, the user may type in a specific unit.
Black Level Adjustment
The number beneath the Black Level scale corresponds to a gray level. There can be
256, 4095 or 65,536 possible gray levels depending on the system type. For the example
below, an 8 bit image will be used with 256 total gray scale values. When the Black
slider is at the very top of the scale, the number is 0. As the slider is moved downwards
along the scale, the number increases and the image becomes progressively darker. This
is because all pixels at the specified gray level and lower are shown on the screen as
black pixels. If the slider is set to 0, all the pixels whose gray levels are at 0 are shown as
black. If the setting is then changed to 60, all the pixels between 0 and 60 are shown as
black and the image appears darker.