This component takes pdf BLOBs from Oracle and converts the contained images into jpgs. I have used it to extract scan-based PDFs from a database and write jpg images to a second table, but it would work for on-the-fly conversion if few records are being converted. The oversampling required for good resolution of the PDF images makes this component run a bit slow, but you can change this in the command line of the run on server component and it will run faster.

The component requires ImageMagick 6.5.4 and Ghostscript on the server; Imagemagick must be in the path environment variable (on Win servers). I have not tested this on Unix. There are many other image conversion and manipulation possibilities with ImageMagick.

http://www.imagemagick.org/script/index.php
http://pages.cs.wisc.edu/~ghost/