looking at the file names I think this is the compressed version http://s3.postimage.org/2qgfsekg7/Front_mini.jpg

I'd like to run it through errorlevelanalysis.com but their service seem to be down.

I suspect it tries to raise the brightness and sharpness of certain pixels before compressing it further so "important" elements stay in detail. What was done to your image though looks nothing like the quality of their examples for the ship, etc.