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Re: filmscanners: LS4000 and sharpness

In a message dated 4/29/2001 3:10:50 AM EST, ross@cgl.ucsf.edu writes:

> Why not some sort of average of the distances sample points,
>  weighted according to the amount of surface area represented
>  by each point. (E.g. if the slide were circular and the samples
>  along a radial line, each would be weighted by the circumference 
>  of a circle with its radius.)

Scanners focus at a fixed scanning position, and do it by varying
the focus distance until the contrast is maximized.  The only real
option is the position of the scan line.

Ed Hamrick


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