In our usage of your system, we allow the users to create/edit documents and to embed images from an image library that we have, which includes some fairly large images.
Suffice it to say, the RTF/DOCX content can become quite large when including these images.
We wanted to know if there is an equivalent of <img src=""> where we can SHOW the image in the document, but not STORE the image in the document.
This should allow us to load the document pretty quickly and save it efficiently.
[Updated by Maria]
The RTF specification supposes storing document images in the hexadecimal (base64) format. If you want to export only an image Uri (not image bytes), I suggest you insert images in the document using the IncludePicture field. This field inserts the picture retrieved from the specified URI. The \d switch enables you to not store the image in a document file. So, if you create an IncludePicture field and specify the required Uri and \d switch in the field code and export the document to Rtf, only the image URI will persist in the exported document.
Note that this field doesn't provide the capability to specify the size that should be applied to the image after retrieving. So, the image is always inserted with its original size.
Please try the recommendations provided in the How to: Reduce the File Size When Saving a Document Containing Pictures article to reduce the exported document size.
Should you have any questions or need further assistance, do not hesitate to contact me again.