thank's my dears for your help...
my data is aster(bands 1 to 9)...i layer stacked and resampling it an performed quick atmospheric correction. you know that QUAC creates a surface reflectance image, scaled into two-byte unsigned integers using a reflectance scale factor of 10,000.
now i want to change this scale factor to 1, so that, it's spectral profile to be comparable with The spectral curves that available in spectral library which my project demands that.
i use ENVI 5.3