How to create a Grayscale function dataset (ArcObjects .NET 10.6 SDK)
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How to create a Grayscale function dataset


Creating a Grayscale function dataset

To create a Grayscale function dataset, follow these steps:
  1. Create the Function Arguments object.
  2. Specify the weights for each band. The weights are specified using a double array. 
  3. Create a Raster Function object.
  4. Create a Function Raster Dataset object.
  5. Create a name object for the function raster dataset.
  6. Specify the output file name for the new dataset.
  7. Initialize the new function raster dataset with the raster function and its arguments.
The following code example shows how to create a Grayscale function raster dataset by applying the Grayscale raster function to an image:
[C#]
// Create the Function Arguments object.
IGrayscaleFunctionArguments rasterFunctionArguments=(IGrayscaleFunctionArguments)
    new GrayscaleFunctionArguments();
// The input data can be of type IRasterDataset, IRasterBand, or IRaster.
rasterFunctionArguments.Raster=inputData;
// Specify the weights for each band.
IDoubleArray conversionWeights=new DoubleArrayClass();
conversionWeights.Add(0.6);
conversionWeights.Add(0.3);
conversionWeights.Add(0.1);
rasterFunctionArguments.ConversionParameters=convertWeights;

// Create the Raster Function object.
IRasterFunction rasterFunction=new GrayscaleFunction();
// Create the Function Raster Dataset object.
IFunctionRasterDataset functionRasterDataset=new FunctionRasterDataset();
// Create a name object for the Function Raster Dataset.
IFunctionRasterDatasetName functionRasterDatasetName=(IFunctionRasterDatasetName)
    new FunctionRasterDatasetName();
// Specify the output file name for the new dataset (including the .afr extension at the end).
functionRasterDatasetName.FullName=@"c:\temp\Grayscale.afr";
functionRasterDataset.FullName=(IName)functionRasterDatasetName;
// Initialize the new Function Raster Dataset with the Raster Function and its arguments.
functionRasterDataset.Init(rasterFunction, rasterFunctionArguments);
[VB.NET]
' Create the Function Arguments object.
Dim rasterFunctionArguments As IGrayscaleFunctionArguments
rasterFunctionArguments=New GrayscaleFunctionArguments()
' The input data can be of type IRasterDataset, IRasterBand, or IRaster.
rasterFunctionArguments.Raster=inputData
' Specify the weights for each band.
Dim conversionWeights As IDoubleArray
conversionWeights=New DoubleArrayClass()
conversionWeights.Add(0.6)
conversionWeights.Add(0.3)
conversionWeights.Add(0.1)
rasterFunctionArguments.ConversionParameters=conversionWeights

' Create the Raster Function object.
Dim rasterFunction As IRasterFunction
rasterFunction=New GrayscaleFunction()
' Create the Function Raster Dataset object.
Dim functionRasterDataset As IFunctionRasterDataset
functionRasterDataset=New FunctionRasterDataset()
' Create a name object for the Function Raster Dataset.
Dim functionRasterDatasetName As IFunctionRasterDatasetName
functionRasterDatasetName=New FunctionRasterDatasetName()
' Specify the output file name for the new dataset (including the .afr extension at the end).
functionRasterDatasetName.FullName="c:\temp\Grayscale.afr"
functionRasterDataset.FullName=functionRasterDatasetName
' Initialize the new Function Raster Dataset with the Raster Function and its arguments.
functionRasterDataset.Init(rasterFunction, rasterFunctionArguments)






To use the code in this topic, reference the following assemblies in your Visual Studio project. In the code files, you will need using (C#) or Imports (VB .NET) directives for the corresponding namespaces (given in parenthesis below if different from the assembly name):
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