These files (even DSM or any large tif file generated) will look black and white when you open with a windows viewer. They are floating point files that cannot be read by standard Image Viewers because they cannot interpret its values. You need to open it with QGIS/ArcGIS. The reflectance map and the index maps you get for thermal have temperature values in each pixel. QGIS is open source and free. More info: https://support.pix4d.com/hc/en-us/articles/205084685-How-to-visualize-the-GeoTIFF-DSM-File#gsctab=0
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