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Well, this is because JPEG is, itself, a compressed format. Compressing an already compressed file yields very poor results, and often increases its size (as it has additional header info to store for each file).
Compressing something like a text file yields very good compression, or compressing an uncompressed image (like an RGB-encoded BMP file).
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Paul M. Victorey
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I am not responsible for any problems that may arise as a result of following my advice. This includes, but is not limited to, computer failure, loss of data, nuclear war, famine, boils, no clean laundry, your daughter running off with a biker gang, or armageddon. Take my advice at your own risk.
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