Why is same file different sizes after saving for web?

I have files that I save in PSCS3, under, "Save for Web & Devices" and I indicate under "optimize to file size" that they should be no larger than 60K. After item is saved and I go to "Get info", it says the file is 60K. Yet when I open the file in PS and go to Image Size, it says 467K. Why the discrepancy? Thanks for your feedback!

One is the compressed file size on disk (60K). The other is the uncompressed image size (369 pixels x 432 pixels x 8 bits per channel x 3 channels / 8 bits per byte  / 1024, since K really is 1024, not 1000).
http://en.wikipedia.org/wiki/Image_compression
[Yoink!]

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