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Re: filmscanners: smart sharpening tutorial

on 9/23/01 11:34 AM, Michael Stephens at mike1964@flash.net wrote:

> For those of us who are novices (with scanning and photoshop in particular)
> can you explain the difference between the smart sharpening technique and
> the previously documented High Pass sharpening?

high pass sharpening increases contrast in areas of high frequency detail

'smart sharpening' uses a filter to find the edges in an image, then
modifies this to construct a mask which is used to only sharpen the edges of
the image, and leave the rest alone.

so smart sharpening is like a very sophisticated version of photoshop's
unsharp mask, wheras hi pass sharpening is another approach completely.

I think you get more control with smart sharpening, but hi-pass can also
work well on some images

John Brownlow



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