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I haven't tried paint.net - will it allow you to specify pixel dimensions and JPEG quality? If it does, it would be quite suitable.
I am sure a number of the free image editing programs would do the job - it's not a high-end function. But I am not sure if/how they would do it as my experience has been with Photoshop.
If you guys are really stuck, I would be happy to install a free program on my computer and work out how to do it, and post instructions.
So see how you go and if there is no joy, let me know.
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