Hello friends, I have a telescopic image in fits format. I have two questions wrt to processing my images: 1. Can I open FITS format in ENVI? 2. I have pixel values in decimals(range : 1000,2000.3 negative values too). I believe these are counts converted from direct voltage to ADUs. How do I convert them to Quantised and calibrated DN values? My objective is to find Radiance from these images at the last. For calibration, im thinking of using the gain values. But I have no clue for quantisation. SO any help in this regard would be highly helpful for my research. Thank you, Aishwarya.