Re: Gamma calculations
Re: Gamma calculations
- Subject: Re: Gamma calculations
- From: <email@hidden>
- Date: Tue, 26 Oct 2004 12:38:21 -0400
Rich,
First, just a precision: the 1.8 gamma for Mac is a "file
encoding gamma", not the monitor gamma.
When you look at the resulting image on a computer
display, the data has gone through the file encoding gamma
(1.8), the (Apple only) Look-Up-Table gamma (1.45) and the
CRT gamma (2.5)(see the suggested links for the
justification of these numbers). All these numbers combine
to give a pleasant output, but your question is related to
the 1.8 file encoding gamma.
If you take the file and send it directly to the
LaserWriter (or many printing devices for that matter) the
result is a pleasant output also. It seems this was done
to minimize file processing when printing.
More info can be found in the final version of the PNG
file format:
http://www.w3.org/TR/PNG/
or the gamma appendix of this version:
http://www.libpng.org/pub/png/spec/1.2/PNG-GammaAppendix.html
or the gamma appendix of version 1.0, which is more
descriptive:
http://www.libpng.org/pub/png/spec/1.0/png-1.0-w3c-single.html.gz#GammaAppendix
Regards,
Danny Pascale
email@hidden
www.BabelColor.com
On Tue, 26 Oct 2004 06:55:39 -0500
Rich Apollo <email@hidden> wrote:
When folks talk about the traditional Mac monitor gamma
of 1.8 being based on the output of a LaserWriter - does
anyone know what was measured or how this was calculated?
Rich Apollo
Priority Litho
314-344-1144
email@hidden
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