Re: Panther, sRGB, web browsers
Re: Panther, sRGB, web browsers
- Subject: Re: Panther, sRGB, web browsers
- From: John Fieber <email@hidden>
- Date: Mon, 15 Dec 2003 14:37:11 -0500
On Dec 12, 2003, at 6:14 PM, John Gnaegy wrote:
Safari assumes untagged images to be in the space of the default
display's profile. This is the same behavior as Preview, so the nice
thing is an image opened in Preview looks the same as an image opened
in Safari, whether it has an embedded profile or not.
[...]
I imagine the choice came down on the side of assuming the display's
profile for untagged data in order to have a unified behavior with
other cocoa apps on the system.
Okay, I'm now puzzled by this. In "ColorSync on Mac OS X"
(
http://developer.apple.com/technotes/tn/tn2035.html) under the heading
"ColorSync Changes for Mac OS 10.2"
Profile Changes when Printing or Displaying Untagged Data
PDF Display
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.
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).
The is arguably sensible an a total-colorsync universe--even untagged
data will at least look consistent (if incorrect) from display to
display. And consistency and predictability are what color management
is all about.
So, is the above note changes in 10.2 not completely accurate, or do
all the Apple applications override this default assumption of Generic
RGB in 10.2+ with the old default assumption of the display profile? Or
does "PDF display" in context mean something other than the PDF that
the core graphics/Quartz drawing APIs generate?
It is a neat idea to have color management integrated at the system
level such that applications using the Cocoa APIs and Quartz get it
more or less automatically, but at the same time the actual
implementation and documentation of the implementation seems rather
confusing, particularly when it comes to printing (as I've posted in
detail before).
-john
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