Sravanthi,
You must use the "data" attribute of your image capture property to access the binary image data in your SQL Step. If your image capture transaction property is called "Picture", you need to access the image flunky data this way:
"<<transaction.Picture.data>>"
You will need to expirement with Base64 encoding and decoding of this string depending on how/where to plan to store the data.
Jason Latko - Senior Product Developer at SAP