The native format or the first format if the native format is not given.
[Visual Basic .NET] Public ReadOnly Property NativeImageFormat As String
[C#] public string NativeImageFormat {get;}
[C++]
HRESULT get_NativeImageFormat(
BSTR* format
);
[C++]Parameters
format [out, retval] format is a parameter of type BSTR
Product Availability
Available with ArcGIS Engine, ArcGIS Desktop, and ArcGIS Server.