Hi! I have 1990 TM scenes and want to convert DN values into spectral radiance. In ENVI's Calibration Utility for Landsat TM data what are the input parameters that ENVI calls ScaleMin and ScaleMax ? In the Help they are defined as satellite parameters set for each band used to derive the gains and offsets (Gains and offsets would not need to be calculated because they are contained in Landsat TM header file!) Are ScaleMin and ScaleMax maybe the lower (Lminë) and upper (Lmaxë) limits of the post-calibrated spectral radiance range? I would really appreaciate any clarification on this point :-) . Thanks!