I lived 39 years before this very thread on the list /grin/... Darren,
what occurs to me is that given that contrast is the rate at which one
tone is changed to another, acutance is indeed very similar to local
contrast.
Obviously, I am not going to be using any of these terms often, but I
want to understand both so as to prevent any misunderstanding should any
of these terms be used here or elsewhere in communication.
Boris
On 1/2/2011 4:46 PM, Darren Addy wrote:
I've lived 51 years without knowing what acuteness is and feel none
the worse for it, so I think we can safely take it out of the English
language. Still, this seems to be a good definition I found while
Googling (to better myself):
"Sharpness is a subjective sensation. Objective correlates of
sharpness are resolution and contrast (MTF curves are one way to
represent resolution and contrast - there are other ways). The term
resolution refers to the ability of a system to separate (i.e.,
resolve) two closely spaced lines. The finer (i.e., the more closely
spaced the lines) the system can resolve, the better the resolution of
the system. Acutance refers to the abruptness of an edge. That is,
does black abruptly become white or is there a border where black goes
to dark grey, light grey before going to white."
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