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Re: Gamma
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Re: Gamma


  • Subject: Re: Gamma
  • From: Marco Ugolini <email@hidden>
  • Date: Wed, 25 Jul 2007 10:16:25 -0700 (GMT-07:00)

Marc Sitkin wrote:

>Not that I want to make myself look like a dinosaur, but this is a link
>to the definition of gamma I learned way back when. Still appropriate
>perhaps?
>
>*http://tinyurl.com/22o5af*

There is a standard definition for "gamma" that can be found in a dictionary:

gam·ma
–noun
1. the third letter of the Greek alphabet.
[...]
8. Television. an analogous numerical indication of the degree of contrast between light and dark in the reproduction of an image in television.

Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.
<http://dictionary.reference.com/browse/gamma>

So, "gamma" is the letter in the Greek alphabet corresponding to a "C", and it's either used as a symbol (Γ), or spelled out ("gamma"), to indicate a numerical entity that apparently originated in the field of television technologies.

Then there is a slightly more pertinent description available from Answers.com:

gamma

The way brightness is distributed across the intensity spectrum by a monitor, printer or scanner.

<http://www.answers.com/gamma>

My take on it is that "gamma" is whatever modification must be made to an incoming signal/input so that the outgoing signal/output *looks* linear to the observer (i.e., "normal" to the human eye -- which may demand that the outgoing signal/output itself be turned into a *non-linear* entity to achieve that goal).

Marco Ugolini
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