I haven't seen this entire thread so this may have been
mentioned already, but I'm wondering if sharpening techniques are recommended
for pictures scanned from negatives. I'm using a Nikon F3 with a variety
of Nikon lenses and a Nikon CoolScan V ED scanner for digital
conversion.
For that matter, since I'm still pretty new to this process
I'm happy to receive any general advice for maximizing the quality of images
scanned through a dedicated 35mm scanner that is not a
flatbed.
Thanks!
Elliot Berlin
------------------------
E Berlin
Media/Documentary Production, Supervision,
& Development
703.356.4004
703.283.5559 cell
From: owner-photoforum@xxxxxxxxxxxxxxxxxxxxxx [mailto:owner-photoforum@xxxxxxxxxxxxxxxxxxxxxx] On Behalf Of balobo@xxxxxxxx
Sent: Friday, November 03, 2006 8:58 AM
To: List for Photo/Imaging Educators - Professionals - Students
Subject: Re: Eaw and sharpening
Thanks much for this great information. Does these figures also apply to
JPEG?
Many Thanks,
Bruce Wolff
On Thu, 02 Nov 2006 18:03:14 -0800 (PST) Herschel Mair <herschelmair@xxxxxxxxx>
writes:
All RAW files will need some sharpening. The digital image is inherently ever-so-slightly unsharp. This is because above the actual ccd there is an optical layer that throws the image slightly out of focus in order to "Spread the light" a little. This is compensate for the fact that each photosite is only reading a single colour in RGB. There is an algorithm that corrects for this but you do need a certain amount of sharpening.As a rule of thumb, in unsharp mask, you can set the diameter to between 1/4 and 1/5 the megapixel size of the image. So, in a 6 megapixel image you can start at about 1.2 (1/5 of 6) which will give subtle sharpening to 1.5 (1/4 of 6) which will give you quite strong sharpening. Start the "Amount" at 100%Increasing the amount will increase the contrast at the edges while the radius changes the thickness of the bright line..Generally I find it is better to increase the amount rather than the radius.The threshold can usually be left at 0. This is for when there's some fine detail that you don't want sharpened. It is useful for skin texture or in noisy images where you don't want the noise or other artifacts sharpened.
Herschel Mair
Head of the Department of Photography,
Higher College of Technology
Muscat
Sultanate of Oman
Adobe Certified instructor
+ (986) 99899 673
