I am working on the raster map below, which has 352 rows and 350 columns. When doing
Data Management Tools->Raster->Raster Properties->Build Raster Attribute Table in ArcGIS 10.3.1 (licence type: Advanced), the analysis of the Attribute Table reveals two groups of cells, as opposed to 352x350 elements.
I have tried
Data Management Tools->Raster->Raster Properties->Split Raster, but the procedure is incredibly slow given the number of cells, and it creates individual rasters, which is not what I want.
I am also using QGIS Version 2.18.2 for Windows, where I have the exact same problem. Hence, a solution for QGIS would work as well.