I need to change my image file size but keep the same pixels. Possible?

I'm trying to upload an image to a mobile ad platform (Adfonic) with the following requirements: Image dimensions 216 x 36 pixels; max file size 3.0 kb; file formats supported GIF, JPG, PNG. I figured out how to change the pixel size but now my file is too big. I have Photoshop CS4 Extended & Vista.
I changed the file resolution but then the pixel size changes. What can I do?
Thanks!

Save-As, JPEG offers you a quality slider. You trade quality for size. This still wouldn't give you what you needed?
You could try JPEG 2000, but beware, it's not as compatible with as many things, and it can look kind of weird, but boy does it compress...
-Noel

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I need to change my image file size but keep the same pixels. Possible?

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