[pure-silver] Re: Film Still Wins ... Even Compared To Leica 18MPix
- From: "Richard Knoppow" <dickburk@xxxxxxxxxxxxx>
- To: <pure-silver@xxxxxxxxxxxxx>
- Date: Tue, 1 Jun 2010 18:01:39 -0700
----- Original Message -----
From: "Peter Badcock" <peter.badcock@xxxxxxxxx>
To: <pure-silver@xxxxxxxxxxxxx>
Sent: Tuesday, June 01, 2010 5:45 PM
Subject: [pure-silver] Re: Film Still Wins ... Even Compared
To Leica 18MPix
The author claims that
"*We know that there is a tight correlation between the
recording of fine
detail and the sharpness of the edge of major subject
outlines. The more
resolution you have, the better the edge contrast and thus
the overall image
sharpness.* "
I thought Barry Thornton debunked that myth in his book
Edge of Darkness.
Barry has example photos using Kodak Technical Pan 25 ASA
film exhibiting
less sharpness than higher ASA films. Of course Technpan
has more
resolution/finer grain.
rgds
Peter
On 2 June 2010 06:45, Tim Daneliuk <tundra@xxxxxxxxxxxxxx>
wrote:
http://www.imx.nl/photo/Film/page169/page169.html
Barry Thornton must have re-invented the wheel. The
point was made by C.E.K Mees, of Kodak Research
Laboratories, in the 1940s, if not before. The term
"acutance" was invented by Kodak to mean the effect of edge
contrast on "perceived" sharpness. It applies to film but a
similar effect is produced in digital processing.
In fact, "sharpness" and edge contrast are only partly
related. Its quite possible for a film or a lens to have
very high resolution but poor acutance. The oldest
illustration of this is in a book on basic photography by
Mees (although I think its a doctored illustration).
Its of interest that the distortion of edges by high
acutance developers can actually reduce resolution.
--
Richard Knoppow
Los Angeles, CA, USA
dickburk@xxxxxxxxxxxxx
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