linux gripped becomes larger

Dear Emdebian Team,
Linux package once gripped is larger than original.
For example :
	linux-image-3.2.0-3-486_3.2.23-1_i386.deb 	22242432 	2012-07-23 15:35:14
	linux-image-3.2.0-3-486_3.2.23-1em1_i386.deb	12-Aug-2012 13:38 	29M	
Taken from
http://snapshot.debian.org/archive/debian/20120723T153514Z/pool/main/l/linux/linux-image-3.2.0-3-486_3.2.23-1_i386.deb
http://www.emdebian.org/grip/pool/main/l/linux/linux-image-3.2.0-3-486_3.2.23-1em1_i386.deb

I suppose there is a special case for packaging linux images.
What do you think about it?

Thanks

--
igor80