Histogram works in a similar fashion to that in Image and other applications except that each dataset has it's own histogram:
Inset Box allows the resizing of the inset box in the same manner as the Bounding Box in Image. You can resize, move or change the shape of the inset.
Freeze Background Slice and Freeze Inset Slice prevent controls from changing which slice is used in those displays. This is most useful when one has only dropped in one database. It's quite convenient to freeze the background, link in a slider, and adjust the inset slice.
Align Inset Database allows the inset database to be moved relative to the background. By default, the inset image's center is aligned with the background's center. This is fine if the two images are the same size and are in the same place. Two other options are available. The menu selection "Align Upper Left" matches up the upper left corners of the two images. The menu selection "Align Meta" matches up the meta data coordinates of the two images and draws the inset in the appropriate place. This can cause mysterious-appearing results if one of the coordinate systems is not set correctly. "Align Center" will return to the original method.
The Grid choice allows several options for drawing grid lines, just as it does in Image.
The Smooth Magnify choice allows several options for drawing replicated pixels, just as it does in Image.
The Overlays menu allows coastlines and other overlays to be drawn, just as it does in Image.
3-Slider will allow registering the inset differently with respect to the background; it will provide the means of sliding it horizontally or vertically.
Normal sliders will control the slices displayed in either the background, inset, or both.
Changing the color palette (by using Color Tool, for example) may be helpful.
A Histogram can control the palette used for the background image only.