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[OM] Re: Simplistic rules for sharpening, was: Zone 10 gallery

Subject: [OM] Re: Simplistic rules for sharpening, was: Zone 10 gallery
From: Moose <olymoose@xxxxxxxxx>
Date: Wed, 05 Mar 2008 16:40:19 -0800
That's the gist of it, as I understand it.

The other thing I learned that surprised me was how lots of noise 
reduction, as the first step, then sharpening and other processing, of 
film scans, especially color negs., could improve them. I didn't use the 
NR techniques he did, though. NeatImage is better.

Moose

Chuck Norcutt wrote:
> I've read most of it but have yet to read every bit of it and know I'll 
> need to re-read it at least once.  However, there are two things you can 
> do easily with one being sort of obvious and the other being derived 
> from my reading of the book.
>
> 1) If you're sharpening for the display then just sharpen to what looks 
> good to you at the actual size you intend to display.
> 2) (and this is my very rough cut summation from the book) If you're 
> sharpening for a print then first, pre-size the image to the resolution 
> you'll use for the print (say, 240-300 ppi) then display the image in 
> your editor at roughly 25-30% and then sharpen until the screen image at 
> 25-30% looks just slightly "crunchy" or a bit over-sharpened.  The point 
> of displaying at 25-30% is to account for the significant differences in 
> resolution between screen and print (say 75ppi vs 300dpi or 1:4).  Then 
> sharpening the screen image until it's very slightly over-sharpened is 
> to account for the softening effect that will come about from laying 
> dots on paper.
>
> This is the simplistic rule I now use for sharpening and it seems to 
> work pretty well.  But YMMV.


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