[Tig] 18% gray?

Tom Nottingham nottinghams
Fri Dec 2 17:11:33 GMT 2005


--
Thanks to everyone for supporting the TIG through
the years.
--
Everyone,

The 18% gray card is so designed because the "Average" scene reflects 18% of
the illumination that strikes it. Use of a spot meter and a 18% gray card
will yield the proper exposure on film of this so called average scene. Skin
tones vary way too much in density to be any kind of realistic standard,
although some photographers use the palm of their hand in a pinch. Before
the use of Incident Exposure Meters became commonplace, the use of a gray
card insured proper exposure for non standard scenes such as backlight, or
high and low key scenes.

Ansel Adams's Zone System is an attempt to tune the Exposure and Development
of film to the contrast index of the original scene. Such developed
negatives would print properly on a number 2 contrast paper with minimal
dodging and burning. Since color stocks behave differently in development,
the Zone System has only minimal application in color photography.

Tom Nottingham

 -----Original Message-----
From: 	tig-bounces at tig.colorist.org [mailto:tig-bounces at tig.colorist.org]
On Behalf Of Jim Mann
Sent:	Thursday, December 01, 2005 3:56 PM
To:	Bob Friesenhahn; Ronald Williams
Cc:	Telecine Interest Group
Subject:	RE: [Tig] 18% gray?

--
Thanks to everyone for supporting the TIG through
the years.
--
Hi All,

18% gray is considered the reflectance value for flesh tone, blue sky and
green grass, (zone 5, I think) That coupled with a white chip and black chip
are the best friends of the colorist.

The Neutral back ground or backlight set up as Mr. Williams suggests is the
way to go. It can be 18% but by no means has to be.

Regards,
Jim

Jim Mann
Senior Colorist
Synchro Film and Video
http://www.digitalvision.se/customers/freelancers_mann.htm
http://tig.colorist.org/wiki2/index.php/User:Jim_Mann




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