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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: Sun, 20 Jun 2004 21:58:25 -0700

Danny,

According to Microsoft, "bright" is anything greater than 64 lux. That doesn't take much -- 64 lux is a little brighter than the light output of a single 35W Solux bulb placed about 10 feet away from the front of display. Not many people work in a room that dark.

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."

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

Resources:
http://www.w3.org/Graphics/Color/sRGB
http://www.physlink.com/Education/AskExperts/ae409.cfm
http://www.soluxtli.com/edu4.htm

My comment:
If Apple designs its system for bright environment, so be it (I am curious to
know how many pro are working in such an environment, but that is yet another
subject). However, it would still be possible to have an overall linear system
gamma by using a 2.2 file encoding gamma AND by changing instead the LUT gamma to
match the bright environment criteria. At least, when someone would look at the
image in a dimmer PC environment, what is assumed by sRGB, the image would look
the same.

Danny Pascale
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  • Follow-Ups:
    • Re: Questions about the UI at 1.8 gamma
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    • Re: Questions about the UI at 1.8 gamma
      • From: Roger Breton <email@hidden>
References: 
 >Re: Questions about the UI at 1.8 gamma (From: email@hidden)

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