C:\test>jimagezipcmp.pl
  adding: 1.png (160 bytes security) (deflated 90%)
  adding: 2.png (160 bytes security) (deflated 89%)
  adding: 1.png (160 bytes security) (deflated 90%)
  adding: 2.png (160 bytes security) (deflated 89%)
1.0272952853598