Digital BW, The Print

Post-capture sharpening is an optical illusion, so testing it is not  
as straightforward as counting visible lines per inch. I don't believe  
there would be any valid method other than visual evaluation, at a  
fixed distance, using side by side prints with the same size, image,  
media, inks, printer, profile and lighting . But then; the results  
would really only tell you about that combo, and might well be  
different for other combos.

C. D. Tobie
WW Product Technology Mngr.
Digital Imaging & Home Theater
DataColor.com
CDTobie@...

On Sep 27, 2008, at 7:48 PM, "E Neilsen" <e.neilsen2@...>  
wrote:

> Paul, Sharpness in the digital landscape has always been an issue  
> for me.
> Aside from the mechanics of focusing the light on the senor, we also  
> have to
> deal with processing of the image; USM in Photoshop, Clarity Slider  
> in LR,
> Nik Sharp, etc.  There are many ways to improve or screw up an  
> image. IS any
> one aware of a good comprehensive test or series of test that have  
> been done
> to take the myth and marketing out of it and get down to the brass  
> tacks?
>
>
>
> Eric
>
>
>
> Eric Neilsen Photo
>
> 4101 Commerce Street, Suite 9
>
> Dallas, TX 75226
>
> 214 827-8301
>
>
>
> http://ericneilsenphotography.com
>
> SKype ejprinter
>
>
>
>  _____
>
> From: DigitalBlackandWhiteThePrint@yahoogroups.com
> [mailto:DigitalBlackandWhiteThePrint@yahoogroups.com] On Behalf Of  
> pr_roark
> Sent: Saturday, September 27, 2008 4:28 PM
> To: DigitalBlackandWhiteThePrint@yahoogroups.com
> Subject: [Digital BW] DSLR sharp? -- was How tiny dots determine real
> resolution in a B&W ink print
>
>
>
> Hi Clayton,
>
>> ... I'd like to see the same subject taken with a 12mp
>> or greater modern DSLR with equivalent lens.
>
> I'm interested in DSLR sharpness or resolution also -- not
> necessarily directly comparing to the test Tyler ran, but to the
> issues of how to get the most out of the DSLR systems, as it relates
> to the type of B&W I do. From my large display landscape
> perspective, resolution was always a significant factor for me.
>
> I've tried for years to have at least some objective criteria. The
> bottom line for resolution has been 5 pl/mm at display size -- where
> I use 16x20 as the main target. 5 lp/mm is what many believe is the
> approximate limit of our eyes at "normal" viewing distance, but with
> the caveat that edge detection visual systems can distinquish higher
> frequencies. (The 5D2 is close on paper, so that is part of why I'm
> going there.)
>
> Optics are an obvious variable I've tried to learn something about.
> Most lens reviews are, however, almost useless in predicting the
> level of performance I want. I've found the MTF curves to be more
> useful, particularly the high resolution (40 lp/mm) tests at
> http://www.photodo. <http://www.photodo.com/products.html> com/ 
> products.html
> (but they're aging).
>
> See also http://www.ocf.
> <http://www.ocf.berkeley.edu/~ashon/photo/comparo6.htm>
> berkeley.edu/~ashon/photo/comparo6.htm for a
> convenient colection of Canon lens MTF charts. These look like what
> Canon publishes on its site, but arranged conveniently.
>
> Note the definitions of the terms.
>
> Right now, I'm inclined to think that the meridonial MTF performance
> at f8 and at the edge of the frame (18 mm out) may be very
> significant for the performance I'm looking for.
>
> See http://www.paulroar <http://www.paulroark.com/BW-Info/MTF-Canon35f2.jpg 
> >
> k.com/BW-Info/MTF-Canon35f2.jpg and look at
> the meridonial MTF measures.
>
> So, right now, while I expect film to take my serious wide angle
> business for a while longer, the Canon 35mm f2 is going to be my
> first attempt at getting the most out of the 5D2 on the wide-normal
> side (with 2-fram shots taking me wider). With the 90 TS, I think
> I'll have my best shot at what I'm looking for.
>
> I'll let you know if the MTF meridonial measure correlation to
> performance continues to hold.
>
> Paul
> www.PaulRoark.com
>
>
>
>
>
> [Non-text portions of this message have been removed]
>
>
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