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Re: Questions about the UI at 1.8 gamma
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Re: Questions about the UI at 1.8 gamma


  • Subject: Re: Questions about the UI at 1.8 gamma
  • From: John Zimmerer <email@hidden>
  • Date: Mon, 21 Jun 2004 11:51:14 -0700

Actually, the sRGB page states that Microsoft believes the average level of illumination to be 200 lux. I would agree with them on that. Which means the average level of illumination is more than 3x the recommendation.

Sorry, should have been more explicit. The 1.8 display gamma compensates for the brighter viewing conditions and results in a more linear system gamma.

From the W3C sRGB page:
"For optimal results, we recommend using the encoding viewing
environment when viewing sRGB encoded images. We also recognize that
this is quite different from typical viewing environment."

And later:
"The encoding ambient illuminance level is intended to be
representative of a dim viewing environment. Note that the illuminance
is at least an order of magnitude lower than average outdoor levels and
approximately one-third of the typical ambient illuminance level."

You know at lot of people who use their computer outdoors?
That statement is there to give a sense of scale, not to be used literally.
As for ambient, it is a moving target, depending on application.

A 2.2 encoding and a 2.2 display gamma doesn't necessarily result in a
linear system gamma. The viewing conditions, display card LUT, black
level and other factors are also in play.
JZ

"necessarily" is the key word here. As long as you want to find reasons for
non-compatibility, the science of color perception is wide and complex enough to
find them. My comment was more in trying to bring more compatibility between 1.8
and 2.2 file encoding gammas while keeping the Apple (bright) viewing conditions.
Some of the effects are more important than others. For example, many non-pro
users with uncalibrated monitors will never notice a black level misadjustment
but they will notice an overall darker or brighter image due to non-matched file
encoding gamma.
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 >Re: Questions about the UI at 1.8 gamma (From: email@hidden)

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