Create New Band
Submenu from Image Analysis Menu on map window.
With Landsat, you can choose whether to use the DN or the radiance or reflectances.
An option on the Imagery tab of the options form determines if the new band is stored as bytes or 4-byte floats.
These will create a grid in the temp directory; you can save them elsewhere if you want to access the grids after closing the program.
Several other options (Principle components, Unsupervised classification) also create a new band.
Last revision 5/7/2018