Triton Perspective - Manual (Page 121)

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Additional adjustments can be made in the Auto Contrast section to enhance the color
distribution. Applying a Bias of 2.4% and a Threshold of 7.4% to the histogram results
shown above yields the following color distribution:
This is a bit extreme but shows how the Bias and Threshold settings can affect the histogram
and resulting color distribution.
5.9.3 Relief Shading
Relief Shading simulates the illumination of the sun on the bathymetry data. This is a global
setting and can only be changed at this node level.