iText-Image(in Unix) to PDF conversion

Hi,

I am new to iText Jar...
My task is i have to capture the image(Image is a graph and all the values in the graph are from database which i am passing dynamically) and store in local directory.actually my code is in unix..(tomcat is setup in Unix)...if any one opens the image in explorer there will be a graph populated on the browser based on values from the server...so i have take the image on the browser and i have to convert it to PDF, once i converted i have to delete the image(temp image created in local directory) in the local directory...

I hope it make sense..
Please help me the code