Images can be added using indirect mode or pass-through mode.
You can find details of these modes in the Image
Handling section of the documentation.
When you add an Image using the Doc.AddImageObject
method it will generally be added using indirect mode.
However some file types do not support indirect mode and can only
be added using pass-through mode. If this is the case the operation
of the Doc.AddImageObject method becomes identical to the Doc.AddImageFile
or Doc.AddImageData
methods.
The value of this property tells you if the image will be added
using indirect mode. It is true for all image types with the exception
of EPS and PS.
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