[delphi.com.ar]

Puedes guardarlo de esta forma, y usar un QRDBRichText para imprimirlo.

var
  AStream : TStream;
begin
  AStream := TMemoryStream.Create;
  Try
     RichEdit1.Lines.SaveToStream( AStream );
     TBlobField( qryFirmas.FieldByName('FIRMA') ).LoadFromStream( AStream );
   finally
     AStream.Free;
   end;
end;

Saludos!