Digital BW, The Print

If you have a great greyscale scan, sharpen with PS, if it isn´t a 
great greyscale scan, throw it away therefor you do not have to 
sharpen it. Look at Unwerth´s photographs! She never knows anything 
about photography, but what crazy prints!!!
You know what I mean?
Bernard from Austria


--- In DigitalBlackandWhiteThePrint@yahoogroups.com, Carl Schofield 
<scho@m...> wrote:
> I use PhotoKit sharpner for my digital camera RGB files, but not 
for 
> the 16 bit grayscale scans of my 4x5 negs.  Unfortunately, 
Photokit 
> Sharpener will only work with RGB files and if I convert my 16 bit 
gray 
> scans to 16 bit RGB things slow to a crawl when the layers start 
piling 
> up and file size exceeds 1 gig.  I'm currently using Deadman's 
custom 
> sharpen action (http://www.pinkheadedbug.com/links.html) for the 
16 bit 
> gray scans so I don't have to convert to RGB and the results are 
as 
> good as PhotoKit.
> 
> On Tuesday, April 13, 2004, at 02:04  PM, Steve Kale wrote:
> 
> > Broadly consistent with the Photokit guys.  Capture sharpening, 
> > Creative
> > sharpening (if desired) and then Output Sharpening.
> >
> >
> > From: hogarth <hogarth@s...>
> > Reply-To: DigitalBlackandWhiteThePrint@yahoogroups.com
> > Date: Tue, 13 Apr 2004 13:19:56 -0400
> > To: "digitalblackandwhitetheprint@yahoogroups.com"
> > <digitalblackandwhitetheprint@yahoogroups.com>
> > Subject: [Digital BW] Sharpening vs. Print size [was: Image 
Density vs.
> > Print Size]
> >
> > Ummm... why not? Worst that can happen is I get flamed as a 
heretic.
> > Again. This theory is not supported by house painters, however. 
8-(
> >
> > Sharpening should be done in several stages. All scanning 
softens the
> > image by definition; scanning lays a deterministic sampling grid 
over a
> > stochastic spread of grain clumps. First, you do what I call a 
grain
> > sharpening, to restore the sharpness of the image after scanning.
> >
> > Digital output also softens an image. Printing, for instance, 
converts
> > square pixels into round-ish blobs of ink. Resampling algorithms 
either
> > sort through data and throw some of it away, or sort through 
data and
> > manufacture more based on what the algorithms see. This of course
> > softens the image. How much softening depends on how much you 
change,
> > and how much you can see.
> >
> > For example, take an image (at 360dpi) and print it at printer
> > resolution 1440, and at 2880 (or any other two printer 
resolutions).
> > When you compare the images, the 2880 often looks sharper than 
the 
> > 1440.
> > It's not because the data in the file you sent to the printer was
> > sharper; that data didn't change. It's because in one case the 
printer
> > used 4 ink dots per pixel, and the other case it used 8 ink dots 
per
> > pixel. The 8 ink dots can more accurately reproduce the pixel, 
and thus
> > the print appears a bit sharper.
> >
> > To deal with this, here's what I do. Of course, YMMV. First, I 
do a
> > light grain sharpening just after scanning (let the cries 
of "heresy!"
> > begin). Then, just before output, I do a heavier sharpening 
(after I
> > resize for output). If you are doing severe downsampling for web
> > publishing, you'll need to really sharpen the image to get it to 
be
> > representative of the image when viewed on a monitor. If I'm 
outputting
> > to a printer and printing a smallish image (8x10 say) the 
sharpening is
> > lighter. As the size goes up, so does the output sharpening. All 
of 
> > this
> > just to get the image to "look consistent" across sizes. To my 
eye.
> >
> > Unfortunately, I haven't come up with a rule of thumb for 
sharpening on
> > either end. On the scanning end, it's going to depend on your 
scanner
> > and your enlargement factor, your film, your processing, etc... 
On the
> > output end, it's going to depend on your output device, your 
> > enlargement
> > factor, the detail in your image, etc....
> >
> > There are those that say that sharpening should be a three step 
thing,
> > with a local area sharpening done as part of image manipulation. 
I've
> > never seen the need for that with my images. Might be useful for 
some
> > though.
> >
> > So.... While I wish that sharpening were a one size fits all 
print 
> > sizes
> > thing, it doesn't seem to work out that way. I'll say it again: 
YMMV.
> >
> >
> >
> >
> >
> > [Non-text portions of this message have been removed]
> >
> >
> >
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