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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. Contrast value; smallest gain

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