The source of the data used to generate the image. 
   Namespace:   Autodesk.Revit.DB  
  Assembly:   RevitAPI  (in RevitAPI.dll) Version: 21.0.0.0 (21.1.1.109) 
  Since:  2021 
  Since:  2021 
Syntax
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| Visual Basic | 
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| Visual C++ | 
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Members
| Member name | Description | 
|---|---|
| Link | The image data is from an externally linked image file. | 
| Import | The image data was imported into the Revit document. | 
| Internal | The image data was created internally. These are rendering images or views saved in the project as images. |