75 dpi 150 dpi
300 dpi 600 dpi
Club of Herculues, RSC Sicinia I, reverse scanned at the indicated DPI, downsampled to 72 dpi (screen resolution) and image width made 200 pixels. No other processing. Unsharp mask at moderate pre-scanning, MagicScan settings were Manual and Auto, done on a UMAX Powerlook III
1200 dpi  

75 dpi 150 dpi
300 dpi 600 dpi

The differences in the effects of resolution (dpi) of a scanned image is more obvious looking at blow-ups of a detail of a coin.

These images were scanned at the dpi indicated, downsampled to 72 dpi and made 200 pixels in width.

 

RSC Furia 18, Celtic war horn and armor.

1200 dpi