Re: Panther, sRGB, web browsers
Re: Panther, sRGB, web browsers
- Subject: Re: Panther, sRGB, web browsers
- From: Chris Murphy <email@hidden>
- Date: Thu, 18 Dec 2003 15:52:15 -0700
On Dec 18, 2003, at 2:07 PM, John Gnaegy wrote:
Can we look forward to a New and Improved version of the ColorSync on
MacOS X document in the future to clarify some of this? Or is the
current implementation state just as confusing as it seems such that
more documentation would just reaffirm the confusion?
What part is confusing? As it is now, standard Cocoa behavior is to
match images to the display's profile. In the case of untagged data,
the display's profile is assumed as the source, which means basically
that no match occurs.
a.) It's not consistent with how some 90% (or greater) expects untagged
images to behave in web browsers, and increasingly from digital
cameras.
b.) It's not consistent with how W3C says to handle web images.
c.) It's not consistent with the ColorSync Preferences dialog which
says the selected default profiles will be used as source for documents
that don't have embedded profiles. This window's phraseology is at best
misleading. What applications use these settings "when a document does
not contain embedded profiles?" It does not also tell the user "your
application must be written to specifically ask ColorSync what these
settings are, or these settings don't do anything."
d.) It's not consistent with TN 2035 which says near the end of the
document under ColorSync Changes for Mac OS 10.2: "On Mac OS 10.2,
untagged RGB data in PDF will be tagged with the Generic RGB profile,
and as a result it will be color-matched to the screen." This does not
occur on Panther. Untagged RGB in PDF is also monitor RGB. Further it
says:
"On earlier versions of Mac OS X, untagged RGB data in PDF would be
tagged with the system profile (the profile returned by the
CMGetSystemProfile function), and as a result, no color-matching to the
screen would occur (because both the source and destination profiles
for the match would be identical)." Under Panther, it seems to have
reverted to the behavior associated with previous versions of Mac OS X.
e.) Also in TN 2035 under PostScript Printing it says "In Mac OS 10.2,
this CIEBasedABC color space is now based on the Generic RGB profile."
And under Panther even CMYK images printed to PostScript devices are
converted to RGB and tagged. TN 2035 implies they will merely be tagged
with a CSA made from either Quartz CMYK Default or the embedded ICC
CMYK profile.
There are quite a few areas that are confusing.
I can't speak for non-graphics-intensive apps developed by other
companies, but ideally they should mimic this behavior. If they use
standard Cocoa behavior it's inherited for free.
I'm not sure what it means to get this for free. This is how things
worked on OS 9 also. Everything was monitor RGB. I don't know how many
times I have heard "everything is always color managed in Mac OS X" -
yet the use of monitor RGB as assumed source isn't color management.
That color management occurs at print time is color management. But the
lack of display compensation for untagged objects isn't.
But in any event this "ideal behavior" is just a bad idea for web
browsers. It's really peculiar that the only web browser on OS X a
person can view most images on the internet the way they were most
likely intended is with Microsoft Internet Explorer (with the ColorSync
option checked).
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: John Fieber <email@hidden>) |
| | >Re: Panther, sRGB, web browsers (From: Chris Murphy <email@hidden>) |
| | >Re: Panther, sRGB, web browsers (From: John Fieber <email@hidden>) |
| | >Re: Panther, sRGB, web browsers (From: John Gnaegy <email@hidden>) |