1. Scale / trimmed  Useful for ignoring the brightest and darkest pixels in an image.  You type in the percent on each end of the distribution to ignore.
2. Scale / fixed limits Same result as trimmed scaling, except you put in the brightness level range to be used -- any pixels outside this range are ignored.
3. Scale / equalized A severe sort of enhancement, but it will take care of the outliers and show something in the image.
4. CLUT / display Gray Level component If you use a slider to bring out detail in an image, the outliers will probably be clipped, along with the image over all intensities being changed.  The gray level component is an 8-bit image of what you see, and can be saved as a TIFF file.

For Data Cubes (in the Cube button of the Data Cube Tool);

1. Cube / trimmed scaling  Each slide is scaled independently of the others, using the percent that you choose.  This usually makes all of the slides in a cube show something, but note that a spectrum of such a cube will be garbaged.
2. Cube / clip to fixed limits. All of the slices are scaled to the same limits, clipping outliers.  The spectra from such a cube will be OK, except that peaks will be cut off at the limit, in other words they will have flat tops.