I'm totally desparate. I realy need help.

I'm doing change detection analysis using landsat images (TM, ETM and OLI) and to normalize data in the preprocessing step I need to convert the Top of the Atmosphere reflectance image of the OLI image from 16-bit to 8-bit to be in the same radiometric resolution with the TM and ETM (ToA reflectance) images.

HOW TO DO IT WITH ENVI 5.3 ?????

Thank you.

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