Scanning pencil drawings from vellum to transparent background??

Hi, how can pencil drawings on vellum (or any white background) be scanned into Photoshop in a way which would render their white backgrounds transparent?
Is there a trick to layer settings, for example, which will take out the (grayish) scanned white background and enable one to replace it with transparency or another color altogether?
Thanks

Those Berg Designs Filters are pretty darn cool Buko- Thanks.
jezzthisisfull,
That filter might do it for you, and you have nothing to lose by trying. If not, you could go about it the old fashion way.
Duplicate the channel that has the most contrast (if there's any difference), apply Levels or Curves to the new channel and really Blast the contrast. (I prefer Curves).
Then use that channel as a mask.
Potential problem: Depending on how clean the line drawings are, you might get fuzzy edges. (You know those little lead flakes that aren't really that noticeable in the originals but always got you busted by your Typography teacher anyway.)
DLS

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Scanning pencil drawings from vellum to transparent background??

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