Image based Text Search

I created a table which contains four columns namely article_id,format,title and text(Blob column which stores documents and images).
I uploaded the following file types into the BLOB column using SQL * Loader.
1. PDF document
2. GIF image
3. JPG image
4. DOC document
5. TXT text file etc.,
I created the index using the following
CREATE INDEX TXT_INDEX ON TXT_TABLE(text)
INDEXTYPE IS ctxsys.context;
When I try to search for an text inside these documents, it works fine for PDF,DOC,TXT file types. If the same text appears anywhere in GIF or JPG image it is not retrieving it.
Can you please help me out in this. It is urgent.
Thanks in advance.
Regards
Raj

The text searching component (interMedia Text) does not index images.

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