Hi John Young,
Thank you for contacting Syncfusion support.
We have checked your query "Whether it is possible to get the currently displayed image from the ImageStreamer or the index of the ImageList". By using the BeforeSliding and AfterSlided event of ImageStreamer we can get the current image index. We have also prepared the sample based on your requirement. Please download the sample for the same from the below link.
Sample:
ImageStreamerSample
If we misunderstood your requirement, please provide us more information regarding the requirement. This would help us to proceed further.
Regards,
Subashini M.