In Photoshop click image/image size/ change size to 350 and then use save as and save it say to desktop for ease of finding it. You will be given a little box that tells the size of the intended save. If its still over 200kb then resize again a bit smaller like 300. Make sure you convert to 8bit first under image/mode otherwise jpeg is not an option for saving and file sizes will be larger.
Greg.
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