gregsfc -- I went back and checked. The only new term was 'algorithm'. Was the link to Google's list of articles on resizing any help? That's the basic course your asking for.
The only way I can think of to reduce file size without resizing would be to compress the file, and that won't give a usable result. JPEG is fine for this purpose. It sounds like your problem is solved by MetroMPG.
MetroMPG -- Is there any way to re-sort my pictures between albums?
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