Hi Jeff. I'm going to poll some internal Pega people for you with more specialist knowledge than I, to see if I can get an answer for you. Do you still need help?

Hi Jeff, I had similar requirement in my project and achieved it as shown below

I had a list of images in a data page and I need to send all these images to PDF.

For all the image streams, I had to add the following syntax before the image stream (depending on your MIME type) and then send for PDF Generation using HTMLToPDF activity.

data:image/png;base64

Hope this helps.

Use the below code in Rule-Obj-HTML rule instance to preview the image
 
<img src="data:image/gif;base64,R0lGODlhDwAPAKECAAAAzMzM/////
wAAACwAAAAADwAPAAACIISPeQHsrZ5ModrLlN48CXF8m2iQ3YmmKqVlRtW4ML
wWACH+H09wdGltaXplZCBieSBVbGVhZCBTbWFydFNhdmVyIQAAOw=="
alt="Base64 encoded image" width="150" height="150"/>
 
If the image stream is dynamically populated, we can use the below code in a control
<img src="data:image/gif;base64,<pega: reference name="Param.Source" /> ">

or

<img src="data:image/gif;base64,<%=tools.getParamValue("Source")%>"alt="Base64 encoded image" width="150" height="150"/>