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Re: use of sRGB as a default
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Re: use of sRGB as a default


  • Subject: Re: use of sRGB as a default
  • From: Chris Murphy <email@hidden>
  • Date: Sun, 20 Jun 2004 14:23:09 -0600

On Jun 20, 2004, at 1:44 AM, John Zimmerer wrote:

Generic RGB Profile.icc is the profile used for untagged RGB images. Its primaries allow for blue skies and red apples.

The primaries of Generic RGB compared to sRGB show it to have a smaller gamut, including in reds and in particular blues where sRGB has a vastly more saturated primary. A 3D gamut plot in either ColorSync Utility or Color Think illustrates that overall Generic RGB has a smaller gamut than sRGB.

That these blue skies and red apples can be displayed as blue and red on a CRT to your liking more than likely means those colors exist in sRGB, since sRGB is based in part on common CRT primaries.

I'm attempting to follow your explanation but quite frankly it's not making sense.

Additionally, its gamma (1.8) matches the gamma used in the Macintosh user interface.

John, please draw me a picture why the gamma used in the Macintosh user interface should bear any weight on the choice of what source profile to assume for untagged images. Do you think most untagged RGB images in the world have a gamma of 1.8, and if so what data supports this conclusion?

Chris Murphy
Color Remedies (TM)
www.colorremedies.com/realworldcolor
---------------------------------------------------------
Co-author "Real World Color Management"
Published by PeachPit Press (ISBN 0-201-77340-6)
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  • Follow-Ups:
    • Re: use of sRGB as a default
      • From: Chris Murphy <email@hidden>
    • Re: use of sRGB as a default
      • From: John Zimmerer <email@hidden>
References: 
 >use of sRGB as a default (From: John Zimmerer <email@hidden>)
 >Re: use of sRGB as a default (From: Chris Murphy <email@hidden>)
 >Re: use of sRGB as a default (From: John Zimmerer <email@hidden>)

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