Re: use of sRGB as a default
Re: use of sRGB as a default
- Subject: Re: use of sRGB as a default
- From: John Zimmerer <email@hidden>
- Date: Sun, 20 Jun 2004 14:24:48 -0700
Chris,
I never said the Generic RGB Profile was larger than sRGB, I said it
was different and didn't suffer the same problems.
As for the UI comment, let me restate it like this:
The Macintosh user interface elements (icons, toolbars, etc.) are all
designed to look "right" on a display with a 1.8 gamma.
As others have already pointed out, you can easily recalibrate your
display to use a 2.2 gamma. In fact, we ship an sRGB profile that users
can easily choose in the Display preference if they don't want to go
through the full recalibration process.
JZ
On Jun 20, 2004, at 1:23 PM, Chris Murphy wrote:
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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