[filmscanners] Re: PS sharpening

["Brian" <bdplikaytis@bellsouth.net>]

Anthony,
    I would like to ask you a question about the proper interpretation of
downsampling. If I scan a 35 mm slide or negative at 4000 dpi in a Nikon
Coolscan 4000 and I want to make a print in Photoshop, I alter the long
dimension to 11 inches (the short dimension ends up at whatever to retain
the proper dimensions). Since this usually ends up in a file size that is
smaller than what it was originally, does this mean the image will be
downsampled?
    If the answer is yes then how do I downsample in powers of 2? do I go
4000 to 2000 to 1000 to 500 to 360, sharpening at each step as you suggest?

thanks,

Brian
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respond to bdplikaytis@bellsouth.net


----- Original Message -----
From: "Anthony Atkielski" <anthony@atkielski.com>
To: <bdplikaytis@bellsouth.net>
Sent: Wednesday, August 07, 2002 8:26 PM
Subject: [filmscanners] Re: PS sharpening


I use a setting of 98 with 0.7-pixel radius and threshold of 2.  If you are
downsampling, downsample in steps of 2x (half, half, etc., until you reach
your final size) and unsharp mask with these parameters after each step
(except the last, if it is substantially less than 2x).  Alternately, you
can reset the parameters for the unsharp mask to match the total
downsampling ratio (radius equal to just slightly less than the total number
of pixels lost), but I don't have much experience with that method.

Note that you may have to reduce these values for very small image sizes,
and increase them somewhat for very large sizes, depending on image detail.

----- Original Message -----
From: "Alex Zabrovsky" <alexz@zoran.co.il>
To: <anthony@atkielski.com>
Sent: Wednesday, August 07, 2002 18:55
Subject: [filmscanners] PS sharpening


Hi.
I would be interested to know how people use Unsharp Mask in PS to make the
images sharper, especially following high settings of GEM (produced by Nikon
IV ED)
I'm still trying to establish the range of best Unsharp Mask settings for
different cases (scenic, portraiture and other kinds).
Let's assume the scanning resolution is 2900 dpi  and 1000 dpi.

Regards,
Alex Z

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