How to save jpeg file into IB4 Blob field

I installed the TJPEGImage package from Inprise site. I can use it to
load a jpeg file into a TImage object but I can not save the jpeg image
into IB4 table.

Anyone can tell me what's going wrong?
I am using C++ Builder 3, InterBase 4.

IB Table field:
    CREATE DOMAIN PICTURE AS BLOB SUB_TYPE 0 SEGMENT SIZE 80;

C++ Code
    SQaction->SQL->Add("update item set ");
    SQaction->SQL->Add("PICTURE = :parmPicture,");

SQaction->ParamByName("parmPicture")->Assign(Image1->Picture->Graphic);

Error Message occurred in complier
   Can not convert TJPEGImage into TParam !

Bravo
Thanks & Regards