I downloaded a 32-bit GeoTiff Sentinel-2 image from 08/08/2016 with which I plan to calculate NDVI in ArcMap, but the resolution is awful. I layer stacked bands 2, 3, 4, and 8 which I had thought are 10m resolution but the image is far from clear. I used the Composite Bands tool to stack but am not sure why even after downloading the image looked so bad.
I wanted to know what to do different or preprocessing steps I may have missed? I have access to ERDAS Imagine too since ArcMap is not great for raster data.