Exporting the table using SQLWorkbench
Imagine you have a table images with a character column filename and a clob column image_data
First you need to install the SQL-Workbench. Install does just mean to extract the archive in that case.
The following command exports the table into a textfile. It does also generate the loader file which can be used with sqlldr. The CLOB data is exported as files with the name image_data_0, image_data_1, ... and will be in the same directory. Those files are referenced in the textfile.