I have been working with multiband images and on calculating standard deviation I am not sure what happens? Usually it's a single band operation so how is it dealt with in ARC GIS?
I wanted to know what is the equation followed to calculate standard deviation for a multiband image in ArcGIS? i.e. i want to know the algorithm that happens to calculate standard deviation in a multiband image using this procedure of ArcGIS
Toolbox > Spatial Analyst > Focal Statistics > standard deviation