Re: Panther, sRGB, web browsers
Re: Panther, sRGB, web browsers
- Subject: Re: Panther, sRGB, web browsers
- From: Chris Murphy <email@hidden>
- Date: Sat, 13 Dec 2003 14:21:09 -0700
On Dec 13, 2003, at 1:45 AM, Jim Sims wrote:
I would assume untagged images on the web to be sRGB
http://www.w3.org/TR/REC-CSS2/syndata.html#color-units -- "All RGB
colors are specified in the sRGB color space"
There's an interesting paragraph that follows this:
"Conforming user agents may limit their color-displaying efforts to
performing a gamma-correction on them. sRGB specifies a display gamma
of 2.2 under specified viewing conditions. User agents should adjust
the colors given in CSS such that, in combination with an output
device's "natural" display gamma, an effective display gamma of 2.2 is
produced. See the section on gamma correction for further details. Note
that only colors specified in CSS are affected; e.g., images are
expected to carry their own color information."
But perhaps even more interesting is the section on gamma:
http://www.w3.org/TR/REC-CSS2/colors.html#gamma-correction
EXCERPT:
"That means the minimal handling they [the application] need to do on
current platforms is:
Mac using QuickDraw: apply gamma 1.45 [ICC32] (ColorSync-savvy
applications may simply pass the sRGB ICC profile to ColorSync to
perform correct color correction)"
But Apple doesn't appear to be a member of the W3C.
Are there any Windows browser supporting profiles? I don't think there
is even one. I would think most images for web use would have been
moved to sRGB so that they would look good to Windows users. They just
don't look right in Safari.
Windows browser assume monitor RGB effectively because they assume sRGB
as source and as destination. I'm looking into whether an explicitly
set display profile will cause display compensation to occur, but I
don't think it does unless a specific profile is requested per:
http://support.microsoft.com/default.aspx?scid=kb;en-us;182484
http://msdn.microsoft.com/workshop/author/filter/reference/filters/
icmfilter.asp
(Apple's web images seem to be "Apple RGB" although they are not
tagged either.)
They are monitor RGB. So what's in the file is sent to the video card,
effectively unmodified.
Am I wrong... I have tried to understand correctly --not wanting to
waste people's time, or embarrass myself.
I think you're on the right track. Monitor RGB makes no sense to me
unless Apple were to deprecate gamma 1.8.
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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| References: | |
| | >Panther, sRGB, web browsers (From: Chris Murphy <email@hidden>) |
| | >Re: Panther, sRGB, web browsers (From: Steve Upton <email@hidden>) |
| | >Re: Panther, sRGB, web browsers (From: Chris Murphy <email@hidden>) |
| | >Re: Panther, sRGB, web browsers (From: John Gnaegy <email@hidden>) |
| | >Re: Panther, sRGB, web browsers (From: Jim Sims <email@hidden>) |