How reduce 'file size' of a JPEG in iPhoto?

I imported a photo into iPhoto that had been created in Photo Booth.
After some minor editing, I saved it in iPhoto as a JPEG.
I intended to use the photo as my 'ID photo' at a social networking website, but found I wasn't able to because the file size limit for such photos is 30K.
My photo is 128K.
*How can I get it down to 30K (in iPhoto or otherwise) -- without losing quality?*
Thanks.

LarryHN wrote:
Other than 'trial-&-error' is there any way I can quickly determine what resolution will get the file size down to 30K?
No
But as a first guess if you cut each dimension in half you should cut the photo size to about 1/4 which is real close to 30K for a 128K photo
Close but no cigar. That only got it down to 48K.
A few minutes later . . .
This gets more interesting by the minute.
If I select a resolution less than what results in a 36K file, I end up with a zero-byte file.
Is that iPhoto telling me it can't reduce a Photo Booth file down to less than 36K?

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