C++
virtual Acad::ErrorStatus unloadThumbnail();
Description
Unloads the thumbnail image created by an earlier call to AcDbRasterImageDef::loadThumbnail. The main image, if one exists, isn't affected by this call.
Returns Acad::eOk if successful, or Acad::eNotOpenForRead if the thumbnail wasn't open for reading by an earlier call to AcDbRasterImageDef::loadThumbnail.