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No... but zipping already compressed (JPG) files won't save you much space. Spend the extra $0.05 on another CD
 

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Jay : Ok, smart a$$es,
It may not save much space, but it was going to save me just enough to fit the 800mgs onto a 700mg disk.
So ha!
[Jim Carrey voice]

Reeeaaalllyyy?

[/Jim Carrey voice]

Usually you might get 1-2% max compression out of a JPG file, and you're suggesting a 15% compression ratio. Most interesting
 

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though your files may take up a certain amount of hard drive space, depending on file size, they MAY occupy less space on the CDROM.

Your original question about 'damage' may be attributed to two different types of compression schemes, 'Lossy' and 'loss-less'. Zip programs are usually loss-less so the original data is maintained. The JPEG compression used to write the file originaly uses lossy compression. Some of the information is lost in the process of saving the image.
 
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