IHS color merge: shows point cloud as overlay with the base map showing through.
Opacity: set level
Thin, map: faster if you skip points
LAS auto thin: the program can attempt smart thinning that will speed up drawing and not create holes.
Thin coeffiecient: with auto thinninng, the value will be PointDensity * ScreenPixelSize * ThinCoefficient
Min and Max Z: the program will attempt to scale the colors, but you can force the extremes to use. You may need to look at a histogram (stats tab) to decide what are the real limits of the data; birds can give anomalous high points and there can also be low points.
Coloring: both the intensity and RGB values are 16 bits in the LAS filel, and supposed to be scaled to use the full dynamic range (so that a division by 256 would lead to reasonable coloring. This is frequently not the the case. You can set the min and max colors, complete black and white respectively, and the program will linearly scale between them. To find out the range of values in the LAS file, and hints at extreme tail values, use Histograms/Counts on the Stats tab.
Last revision 2/4/2018