Re: Designers, Color Management, and Xrite , some thoughts and comments.
Re: Designers, Color Management, and Xrite , some thoughts and comments.
- Subject: Re: Designers, Color Management, and Xrite , some thoughts and comments.
- From: Graeme Gill <email@hidden>
- Date: Mon, 21 Apr 2008 15:15:18 +1000
Uli Zappe wrote:
2. While it's obvious that a unified gamma should be the long term
solution, it's not obvious that this gamma should be 2.2. As I said,
personally, I feel that the whole gamma concept is a historical burden
and the long term unification goal should be 10 bit colors and a
"gamma" of 1.0. Let the LCDs or whatever output media we have take care
of their own linear response, period.
2.2 is not an arbitrary choice. It was dictated by the (very fortunate)
coincidence that a CRT has a natural gamma of about 2.5. The 2.2
created in the studio when displayed on a CRT with a gamma of 2.5
applies a viewing transform that makes the result look right
in the darkened viewing environment typical of home (CRT) television.
If the CRT didn't have such a gamma, then some other display
technology would have been chosen, or a gamma of 2.5 artificially
imposed on it, because it matches quite well the way we perceive
equal gradations, and therefore minimizes the impact of noise (be it
due to analogue transmission of digital quantisation) in the
transmission channel. Read Charles Poynton's book ("Digital Video and HDTV")
if you want a good introduction to all this.
The choice of 1.8 was (as I understand it) a rather artificial one,
dictated by the dot gain of the first Apple laser writer, and
the performance limitations of the processors of the time (as well
as perhaps, the desire to avoid 8 bit quantization loss between
screen and print).
Graeme Gill.
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| References: | |
| | >Re: Designers, Color Management, and Xrite , some thoughts and comments. (From: Andrew Rodney <email@hidden>) |
| | >Re: Designers, Color Management, and Xrite , some thoughts and comments. (From: Uli Zappe <email@hidden>) |
| | >Re: Designers, Color Management, and Xrite , some thoughts and comments. (From: Uli Zappe <email@hidden>) |
| | >Re: Designers, Color Management, and Xrite , some thoughts and comments. (From: "email@hidden" <email@hidden>) |
| | >Re: Designers, Color Management, and Xrite , some thoughts and comments. (From: Uli Zappe <email@hidden>) |
| | >Re: Designers, Color Management, and Xrite , some thoughts and comments. (From: "email@hidden" <email@hidden>) |
| | >Re: Designers, Color Management, and Xrite , some thoughts and comments. (From: Uli Zappe <email@hidden>) |