I usually scan it at 400dpi with the "descreen" option on and a slight dose of sharpening, then in Photoshop, I reduce proportionally it to no more than 500 pixels wide. I usually save the images as 60% compressed JPEGs.
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BWJM, F.O.N.A.
Life Member of CPMS, RCNA, ONA, ANA, IBNS, WCS.
President, IBNS Ontario Chapter.
Treasurer, Waterloo Coin Society.
Show Chair, Cambridge Coin Show.
Fellow of the Ontario Numismatic Association.