On Fri, Dec 31, 2010 at 10:00 AM, Boris Liberman <bori...@gmail.com> wrote: > Godfrey, are you trying to say that sharpness is a theoretical parameter > measured in the lab under very specific conditions or computed based on the > spec whereas acutance is practical /perceived/ sharpness of an image > obtained under real life shooting conditions, processing thereafter and > finally presentation (print or computer display, etc)?
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? -- Godfrey godfreydigiorgi.posterous.com -- PDML Pentax-Discuss Mail List PDML@pdml.net http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
