Any image files can be inserted and commented with PDF Annotator.
Inserting Images
Choose Edit
Insert Image to select an image file and insert it into a PDF document. After inserting it, you can change its position or its size by dragging one of the corners.
See also
Using the Selection Tool and Editing Annotations
Page URL: http://www.GRAHL-software.com/pdfannotator/std/en/help/index.html?toolsinsertimage.htm