Sharpness in Tiff Scans

I have done a number of scans of 35mm and m/f frames, using a Nikon
Coolscan and an Epson 4990. On the Nikon I've used their scanning
software, on the Epson SilverFast.

Each image has been scanned twice. First 2000 dpi jpg; second 4000 dpi
tiff. Apart from that all other settings were the same.

I am puzzled because in every case on enlargement the tiffs look
markedly inferior to the jpgs which are sharper. I had expected the
opposite to be the case.

Can anyone throw light on why this might be, and more importantly
suggest a solution? All suggestions gratefully received.

Jeff Underwood
.

Relevant Pages

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