Ah ok :-)
Thanks Michael
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To take it a step further (and I am by no means an expert), I believe file size scales with the complexity of the subject. If, for example, you had an image that was a blank image, the complexity would be very low, and would give the best compression. On the other hand, if you a highly complex image... lots of shapes / colors in non repeating sequences, then compression would be on the low end of the scale (larger file size).
Same goes for other compression engines... such as mp3 for music and whatever they use for satellite TV. I have directTV at home and the image on the screen becomes blockier (when viewed closely) under high action sequences. Compression efficiency goes down and, in the case of DirectTV that has a fixed bandwidth, something has to give.