How to add or remove a color map from a raster dataset

Adding or removing a color map from a raster dataset

1. Cast to IRasterDatasetEdit for the color map operation.
2. To add a color map, get the color map from the color map raster dataset through the raster band object and use the AlterColormap method on IRasterDatasetEdit.
3. To remove a color map, call the DeleteColormap method on IRasterDatasetEdit.
   
   See the following code example:
   

[C#]

static void AddRemoveColormap(IRasterDataset rasterDataset, IRasterDataset
    colormapDataset)
{
    //If the colormapDataset is null, it will remove the color map.
    //If the colormapDataset is not null, it will add the color map of the colormapDataset to the input raster.

    //Cast to IRasterDatasetEdit for the color map operation.
    IRasterDatasetEdit rasterDatasetEdit=(IRasterDatasetEdit)rasterDataset;

    //Add a color map from a given raster dataset.
    if (colormapDataset != null)
    {
        //Get the raster color map from the given raster dataset.
        IRasterBandCollection rasterBandCollection=(IRasterBandCollection)
            colormapDataset;
        IRasterBand rasterBand=rasterBandCollection.Item(0);
        IRasterColormap rasterColormap=rasterBand.Colormap;
        if (rasterColormap != null)
        {
            rasterDatasetEdit.AlterColormap(rasterColormap);
        }
    }
    else
    {
        //Remove the raster color map.
        rasterDatasetEdit.DeleteColormap();
    }
}

[VB.NET]

Public Sub AddRemoveColormap(ByVal rasterDataset As IRasterDataset, ByVal colormapDataset As IRasterDataset)
    'If the colormapDataset is null, it will remove the color map.
    'If the colormapDataset is not null, it will add the color map of the colormapDataset to the input raster.
    
    'Cast to IRasterDatasetEdit for the color map operation.
    Dim rasterDatasetEdit As IRasterDatasetEdit=CType(rasterDataset, IRasterDatasetEdit)
    
    'Add a color map from a given raster dataset.
    If Not colormapDataset Is Nothing Then
        'Get the raster color map from the given raster dataset.
        Dim rasterBandCollection As IRasterBandCollection=CType(colormapDataset, IRasterBandCollection)
        Dim rasterBand As IRasterBand=rasterBandCollection.Item(0)
        Dim rasterColormap As IRasterColormap=rasterBand.Colormap
        If Not rasterColormap Is Nothing Then
            rasterDatasetEdit.AlterColormap(rasterColormap)
        End If
    Else
        'Remove the raster color map.
        rasterDatasetEdit.DeleteColormap()
    End If
End Sub

See Also:

How to access a raster dataset

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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):

• ESRI.ArcGIS.DataSourcesRaster
• ESRI.ArcGIS.Geodatabase
• ESRI.ArcGIS.System (ESRI.ArcGIS.esriSystem)

Development licensing	Deployment licensing
ArcGIS Desktop Basic	ArcGIS Desktop Basic
ArcGIS Desktop Standard	ArcGIS Desktop Standard
ArcGIS Desktop Advanced	ArcGIS Desktop Advanced
Engine Developer Kit	Engine