Greetings,

I am trying to compute Map Algebra using the Raster Calculator in ArcGIS 10.5 to find the mean of a set of raster (.tif) layers. The raster layers have an 8-bit radiometric resolution so I have 256 ‘shades’ of data in each raster layer. However, after the computation, my new composite raster only has 252-254 possible data values. I kept the default parameters in the Environment settings, so I am wondering whether I missed in the Environment, or is this a glitch with ArcMap 10.5?

Thank you,

Brent

Have you tried CellStatistics

and with regards the RasterCalculator issue, do all the rasters have the same spatial reference, cell size and origin?

and, for example, (256+256+200)/3 = 237 which means that the output could have a value less than 256. Maybe I'm not understanding what you are saying.