Added optional jpg-compression in the 1.3 release. (-j vs. -p switch)
Get the latest version and source code on the first page of the thread.
It creates only one mipmap, all other mipmaps point to the same image, so it should create smaller images than wc3viewer etc.
BTW I wonder if War3 uses mipmapping at all?
Oh, thanks to the IJG guys for their jpeg lib.