# Bitwise Not (Spatial Analyst)

## Summary

Performs a Bitwise Not (complement) operation on the binary value of an input raster.

## Illustration

 OutRas = BitwiseNot(InRas1)

## Usage

• If an input is floating-point, the values are converted to integer values through truncation before the bitwise operation is performed.

• In bitwise operations:

• Binary values are stored in two's complement.
• The tools work on 32-bit integers.
• The leftmost bit position is reserved for the sign (positive or negative) of the value. If the integer is positive, the bit position is 0; if it's negative, the bit position is 1.

• The Bitwise Not operation treats the sign bit as it would any other bit. If the input for a cell location is negative, the output is negative; if the input is positive, the output is positive.

## Syntax

BitwiseNot (in_raster_or_constant)
 Parameter Explanation Data Type in_raster_or_constant The input raster on which to perform the Bitwise Not (complement) operation.A number can be used as an input for this parameter, provided a raster is specified for the other parameter. To be able to specify a number for both inputs, the cell size and extent must first be set in the environment. Raster Layer | Constant

#### Return Value

 Name Explanation Data Type out_raster The output raster. The cell values are the result of a Bitwise Not operation on the input. Raster

## Code Sample

BitwiseNot example 1 (Python window)

This example performs a Bitwise Not operation on an input GRID raster.

```import arcpy
from arcpy import env
from arcpy.sa import *
env.workspace = "C:/sapyexamples/data"
outBitwiseNot = BitwiseNot("degs")
outBitwiseNot.save("C:/sapyexamples/output/outbitn")```
BitwiseNot example 2 (stand-alone script)

This example performs a Bitwise Not operation on an input GRID raster.

```# Name: BitwiseNot_Ex_02.py
# Description: Performs a Bitwise Complement operation on the
#              binary value of an input raster
# Requirements: Spatial Analyst Extension
# Author: ESRI

# Import system modules
import arcpy
from arcpy import env
from arcpy.sa import *

# Set environment settings
env.workspace = "C:/sapyexamples/data"

# Set local variables
inRaster = "degs"

# Check out the ArcGIS Spatial Analyst extension license
arcpy.CheckOutExtension("Spatial")

# Execute BitwiseNot
outBitwiseNot = BitwiseNot(inRaster)

# Save the output
outBitwiseNot.save("C:/sapyexamples/output/outbitnot")```

## Licensing Information

ArcView: Requires Spatial Analyst
ArcEditor: Requires Spatial Analyst
ArcInfo: Requires Spatial Analyst

6/29/2011