Weird JPG compression question

Hi,
I am using I am using Windows 7 x64. My camera (Nikon D700) automatically saves copyright data with my name and phone number. I am editing thoose JPEG files from Photoshop CS5 and save them on a HDD with compration ratio 12. For example:
http://dl.dropbox.com/u/26109102/TEST1.jpg
As you can see file size is about 4.67 MB
However, when I right click to file in windows 7 and choose properties and than remove my phone number, file size dramatically reduce at 1.45 MB. Here is a file:
http://dl.dropbox.com/u/26109102/TEST1%20-%20just%20remove%20phone%20number.jpg
So what is the reason of that? Whan I compare both files I can not see the difference in compression. Could you also check it please. Is it a kind of bug?
Thanks in advance.
Koray

The original compression ratio is 66MB/4.5MB = 15 (mental arithmetic).
The final compression ratio is about 66MB/1,45MB = 45.
Such a high compression should be clearly visible, mainly at edges.
But the two images are almost identical. Use image calculation > subtract
and analyze the resulting alpha channel.
a) by histogram
b) by an extremely steep curve.
There are differences, but these are very small.
In my opinion the question is not yet answered. Or is the answer "Microsoft
has improved the standard JPEG compression by factor three"?
I'm using older software, therefore I can't reproduce the OP's tests.
Best regards --Gernot Hoffmann
Edit:
Compression by factor 45 for arbitrary images would deliver really bad results.
The situation here is slightly less critical, because large parts of the image are
almost uniform.
But even if we assume an effective compression by factor 25 for the image parts
with details - the compression artifacts should be visible, in my opinion.
But the aren't. Here we need some clarification.
Message was edited by: Gernot Hoffmann

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