[filmscanners] RE: Scanning with too much resolution? (was:PS sharpening...)

["Paul D. DeRocco" <pderocco@ix.netcom.com>]

> From: Julian Vrieslander
>
> I think, perhaps, you meant
>
> "... may not be able to reproduce the original details correctly, ..."
>
> or, at least, that wording makes more sense to me.

No, what I meant is that instead of making each pixel the average of the
entire area it represents, it may instead be taking a sample of a smaller
point. This would mean that a block of pixels would be sampling a block of
discontiguous small points, and ignoring the light between them. This has
the effect of taking finer detail and aliasing it down.

> Yes.  But what I found most surprising about the example images
> in Margulis'
> book, was that the image scanned at the lower sampling rate appeared to be
> sharper, and not just in the areas of texture, like the grass.
> Try viewing
> these images with Acrobat set to display at 200% zoom.  Look at the white
> straps and the hems around the edge of the horse blanket.  In the image
> scanned at low res, the lines are rough from pixellation, but
> they have good
> definition.  In the the high res, downsampled scan, the lines are
> smoother,
> but less sharp.

Is this an e-book or something? Or are the images online somewhere for free?

--

Ciao,               Paul D. DeRocco
Paul                mailto:pderocco@ix.netcom.com

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