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     áòèé÷ :: Filmscanners
Filmscanners mailing list archive (filmscanners@halftone.co.uk)

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Re: filmscanners: Vuescan sharpening ( reflection on sharpening in general)



1)    The only details that show up would be the radius pixels the
sharpening itself creates, which is exactly what we want.

By sharpening initially we create these extra pixels.  Thereafter, applying
levels and curves alters all pixels including these new extra pixels, and
the levels and curves applications will tend to soften some or many edges.
So we sharpen a second time.

Therefore IMHO sharpening initially at scan time is unnecessary and
detrimental.

2)    True, but this does not ultimately matter.  Sharpening initially does
not merely restore the original pixels to their original values, whatever
they might be, but it *adds additional pixels* consisting of the radius
created by the unsharp mask.  Sharpening last, after all other manipulations
or corrections, will accomplish the same thing but better, as all pixel
changes have by then been made and the final edge lines set.

Maris

----- Original Message -----
From: "Erik Kaffehr" <Erik.Kaffehr@swipnet.se>
To: <filmscanners@halftone.co.uk>
Sent: Sunday, March 18, 2001 10:36 AM
Subject: Re: filmscanners: Vuescan sharpening ( reflection on sharpening in
general)


Hi!

This is not really about sharpening in vuescan, but a reflection on
sharpening in general.

1) Sharpening should be done before retouching the image, because sharpening
causes many details to show up which have to be retouched.

2) Scanning itself introduces some unsharpness, I think it may be reasonable
to apply some sharpening early in the process to compensate for this.

Looking forwards to comments, but please no flame war :-)

Regards

Erik Kaffehr
On Sunday 18 March 2001 14:44, you wrote:
> It's generally advised that sharpening should be the final step on a
> file before printing or publication, but Vuescan, like most scanning
> software, has a sharpen filter.
>
> Since I always end up doing some work in Photoshop I never use
> sharpen filters in scanning software. However, I'm curious: just how
> much "damage" does the Vuescan filter do to the image? Since the
> amount is fixed, I assume the effect is less noticeable on larger
> files.
>
> Jeremy Nicholl

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Erik Kaffehr                erik.kaffehr@swipnet.se alt. ekr@ksu.se
Mariebergsvägen 53          +46 155 219338 (home)
S-611 66 Nyköping           +46 155 263515 (office)
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