SQL & PL/SQL :: Extracting Long Raw Columns

I'm creating a package function that would return the image from the table HR.PER_IMAGES.

Here's the table description of HR.PER_IMAGES
IMAGE_ID NUMBER(15)
IMAGE LONG RAW
PARENT_ID NUMBER(15)
TABLE_NAME VARCHAR2(30)

I have also created a simple PL/SQL code that would supposed to extract the value of the IMAGE column and store it in a variable then return it from a function.

DECLARE
x LONG RAW;
BEGIN
SELECT image
INTO x
FROM per_images
WHERE parent_id = :p_parent_id
;
END;

However, I'm getting the "ORA-06502: PL/SQL: numeric or value error" message. I have tried retrieving an specific image using Oracle Reports Developer and when I queried it was able to render the image on the report page.