Available with Image Analyst license.
Available with Spatial Analyst license.
Overview
Finds the remainder (modulo) of the first raster when divided by the second raster on a pixelbypixel basis.
Notes
The order of the inputs is important and affects the output result.
Mod assumes both its inputs are integers. If any inputs are not integer, those inputs will be converted to integers through truncation. Output values are always integers.
Any value modulated (divided) by 0 is assigned NoData in the output. Therefore, any location on the second input that is either 0 or NoData will return NoData for that location on the output.
If the second input value (the divisor) is larger than the first input value (the dividend), the output will be the same value as the first input. For example, if you were to divide a value of 8 by the value 10, the integer division calculation will return the input value 8 for the remainder.
If both inputs are single band rasters, or one of the inputs is a constant, the output will be a single band raster.
If both inputs are multiband rasters, the function will perform the operation on each band from one input, and the output will be a multiband raster. The number of bands in each multiband input must be the same.
If one of the inputs is a multiband raster and the other input is a constant, the function will perform the operation against the constant value for each band in the multiband input, and the output will be a multiband raster.
If both inputs are multidimensional rasters with same number of variables, the function will perform the operation for all slices with same dimension value, and the output will be a multidimensional raster. The variables in the inputs must have same dimensions or a common dimension but no uncommon dimensions.
If one of the inputs is a multidimensional raster and the other input is a constant, the function will perform the operation for all slices for all variables against the constant value, and the output will be a multidimensional raster.
Parameters
Parameter name  Description 

Raster  The numerator input. A constant value can be used as an input for this parameter, provided a raster is specified for the other parameter. 
Raster2  The denominator input. A constant value can be used as an input for this parameter, provided a raster is specified for the other parameter. 
Extent Type  Choose which extent should be used in the output raster:

Cellsize Type  Choose which cell size to use in the output raster. If all the input cell sizes are the same, all the options will yield the same results.
