You can simply run the a query similar to the following to access the image:
SELECT bfile_column FROM your_table;
However, it is up to the application to know what to do with that data. SQL*Plus is a text tool, as such, it cannot display images. SQL*Plus would not be able to handle the data that is returned from the query above.
How your application handles this binary data depends on the development platform. Please read the Application Developer's Guide -- Large Objects in the Oracle docs for examples on many common development platforms.
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