Contrast Parameter
The Contrast
parameter exclusively applies to the Response Control lookup table definition method.
It implements a control similar to the contrast control of a television monitor.
The slope of the transformation law is the gain, which is non-linearly controlled from the Contrast
parameter.
Mathematically, the relationship is: Gain = 102x(Contrast-1)
Contrast | Gain | Note |
---|---|---|
0.00 | 0.01 |
Min. |
1.00 | 1 | Default Contrast value;unity gain |
2.00 | 100 | Max. Contrast value; largest gain |
To achieve a required given gain, the contrast control should be set to:
Contrast = 1 + (log10 Gain)/2
If the required gain is expressed in decibels (dB):
Contrast = 1 + Gain(dB)/40
The following charts explain the effect of Contrast
when all other controls are set to their default value:
Brightness = 0.00
Visibility = 0.00
Negative = FALSE