Step 1) Create a Table to store the image in
create table t
Step 2) Upload an Image
Choose an image from your file system, and commit your changes.
Step 3) On the "Data" tab, click the "..." button with the BLOB column.
Step 4) In the dialog box, check the "View as Image" box
And that's it... Looks a lot better than SQL*Plus would display images :)
SQL> select img
2 from t
SP2-0678: Column or attribute type can not be displayed by SQL*Plus