Size of Logo using OLE object

Hello,

We are trying to figure out what influenses has the OLE object in size of DB. We have our logo  in form of OLE object which is used in all our models and our DB grew to almost to 700 Mb! It could be the reason? The Logo file size is 65K, png file. If yes, what should we change it for?  And how it possible to "shrink" our DB to make it "lighter" .

Thank you in advance.