On 1/2/2011 12:53 AM, Godfrey DiGiorgi wrote:
On Fri, Dec 31, 2010 at 11:01 PM, Boris Liberman<[email protected]> wrote:
On 12/31/2010 9:58 PM, Godfrey DiGiorgi wrote:
Not quite ... at least our use of words in explanation differs. I'll
bulletize:
- I use the term sharpness to indicate a quality I perceive an image
to have, using my eyes to judge with, not a measuring instrument.
- I use the term actuance to indicate a measured resolution of a
recorded photograph. It is always the observed resolution of an actual
photograph and is synonymous with resolution in that sense.
- I use the term resolution to indicate the calculated or theoretical
capability for detail in a medium, usually. It can also be used to
refer to the measured, observed detail of a specific photograph in
which case it is the same as actuance.
Is that clearer to you?
Only partially.
It is then that LR control called "clarity" should have direct effect on
acutance of an image either displayed to you or printed, right?
Clarity has nothing to do with actuance. Clarity is a 'smart' mid-tone
contrast adjustment tool.
Oh... Well, I've reread and reread and reread again your answers,
Godfrey. Here is what I managed to make out of them.
1. Sharpness is a perceived quality of a displayed image.
2. Acutance and resolution are measured. Resolution is more theoretical
such as a resolution of a lens and acutance is more practical, depending
on the specifics of the given image (screen, paper, etc).
If that's correct then it would seem that I got it upside down thinking
that resolution is measured and acutance is perceived...
Boris
--
PDML Pentax-Discuss Mail List
[email protected]
http://pdml.net/mailman/listinfo/pdml_pdml.net
to UNSUBSCRIBE from the PDML, please visit the link directly above and follow
the directions.
