A raster layer must be loaded into ArcMap in order to use this
tool. If you wish to clip to the extent of another layer (raster or vector)
that layer must also be added to ArcMap prior to starting the tool. If you wish
to clip to the extent of a polygon, a single polygon must be selected in a polygon
layer prior to starting the tool.
Raster layers in ArcMap display a maximum of 3 bands. A raster dataset on a disk
can have more than 3 bands. This tool accesses the raster dataset on the disk
to ensure that all the bands in the raster are retained in the new raster layer,
not just the three bands that are loaded in ArcMap. The order of the bands is also
retained in the new raster layer.