Hi Pallini,
Thank you for using Essential PDF.
Presently we do not support loading image from relative URI in silverlight. However we can insert image in PDF by using the image as embedded resource. Please have a look at the sample in the link below to achieve the same.
Sample:
http://www.syncfusion.com/uploads/redirect.aspx?&team=support&file=ImageInsertion-1977727077.zipPlease try this and let us know if you have any questions.
Regards,
Pravin.
Note: In silverlight we do support only JPEG images. Please refer to the documentation of supported elements in the below link:
http://help.syncfusion.com/UG/Reporting/PDF/Silverlight/Documents/45supportedelements.htm