How to reduce the number of bytes for a picture

I want to reduce the number of bytes used for a picture to be sent to a site like Ebay or craigslist. I son't see any options in Iphoto for this purpose.

You can do it in Preview.
Open the image in Preview. Under Tools, click Adjust Size.
Scale it down to the smallest acceptable size (the website should give a suggested resolution).
Then go to File -> Export, save it as a Jpeg.
Smaller size image means smaller file size.

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    Message was edited by:
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    Message was edited by:
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