Kofax vrs4 User Manual

Chapter 3

VRS User’s Manual

When the Auto Brightness check box is selected, VRS automatically assigns optimal 

values for brightness and displays those values in the manual Brightness slider and 

numeric text box. The Auto Brightness setting is not applicable when you scan in 

color mode.

Moving the Brightness slider, entering a value in the Brightness numeric text box, or 

clicking in the Brightness-Contrast custom control turns off Auto Brightness.

What are brightness, contrast, and gamma in VRS? When an image has high 

brightness, it seems to give off more light. It is like looking at a drawing under a 45-

watt bulb, then looking at it using a 75-watt bulb. The drawing will seem “brighter” 

under the 75-watt bulb. In the same way, moving the Brightness slider up will 

increase the amount of light in the image. Moving it down will decrease the amount 

of light.

The VRS manual brightness setting ranges from 0 (very dark) to 100 (very bright). 

Adjusting the manual brightness setting by moving the Brightness slider, by entering 

a new value in the Brightness numeric text box, or by clicking within the Brightness-

Contrast custom control causes Auto Brightness to be turned off.

Another way to understand the use of the Brightness slider is how it affects the 

content in the image. The Brightness slider affects how background and fill colors, as 

well as highlighted areas, are enhanced. As the Brightness slider is adjusted to a 

higher value, less of the background and fill colors, as well as the highlighted areas, 

are enhanced. When the Brightness slider is adjusted to a lower value, more of the 

background and fill colors, as well as the highlighted areas, are enhanced.

Contrast is the amount of difference between the lightest and darkest areas on an 

image. For example, the ratio of light to dark in a photograph stays the same, 

regardless of the flash you use. When you increase the contrast on a totally bitonal 

image (binary image), the white parts become whiter and the black parts become 

blacker.