Re: Panther, sRGB, web browsers
Re: Panther, sRGB, web browsers
- Subject: Re: Panther, sRGB, web browsers
- From: Uli Zappe <email@hidden>
- Date: Mon, 15 Dec 2003 20:46:39 +0100
Am 15.12.2003 um 17:43 schrieb Chris Murphy:
Aha. Yes this is confusing. You are seeing the effect of calibration,
not the profile itself. Displays are calibrated through the adjustment
of a set of tables in the video card. The intent of it is to set white
point and gray balance primarily. And the Display Calibrator assumes
that you are following its instructions, and have ended up with a well
behaved monitor. So when it builds the profile, it includes the
calibration information for the video card, and then builds the
characterization of the monitor (now well behaved) to the profile as
well.
So technically we have a shotgun wedding between calibration and
characterization when it comes to display profiles. The
characterization portion is what's involved in defining the actual
primaries, tone response, white point, etc. of your display, and is
the only portion used by ColorSync. The display manager (if it's still
called that on OS X), grabs only the calibration data when you log in,
and applies that to the video card. This affects things system wide,
and is not a ColorSync induced conversion, but rather data being
passed through, effectively, a set of curves in the video card.
Please excuse my slow-wittedness at this point, but once the display is
"well behaved" thanks to "calibration", for what else do individual
applications (or whatever) possibly need an additional ColorSync
"characterization" display profile? One would assume that "well
behaved" means "standardized" in some way, so individual apps could
simply assume that the display they send their output to conforms to
these standards, and that that would be all there is about color
management of displays.
Or is it something like: even "well behaved" displays differ from each
other in their abilities (color range etc.), and the ColorSync profile
informs apps that want to know about these capabilities (for whatever
reason)?
Either way something isn't quite right. I'd need to see a bunch of
different PostScript files generated by the system with different
settings, and then also print a bunch of tests to the printer in order
to figure it all out though.
Of course you can't do that from afar (and you've already helped a lot
- thanks!!).
I've emailed HP support with this question. If and when I receive an
insightful answer, I will keep you informed.
It seems to be a more general HP (at least) issue, because as Chris
Brown <email@hidden> wrote, he encounters exactly
the same problem with his Color LaserJet 5/5M.
Welcome to the color management club!
Amazon.de just informed me they shipped my copy of your book, so
starting tomorrow I'll be smart! 8-)
Bye
Uli
________________________________________________________
Uli Zappe, Solmsstra_e 5, D-65189 Wiesbaden, Germany
http://www.ritual.org
Fon: +49-700-ULIZAPPE
Fax: +49-700-ZAPPEFAX
________________________________________________________
_______________________________________________
colorsync-users mailing list | email@hidden
Help/Unsubscribe/Archives:
http://www.lists.apple.com/mailman/listinfo/colorsync-users
Do not post admin requests to the list. They will be ignored.
| References: | |
| | >Re: Panther, sRGB, web browsers (From: Roger Breton <email@hidden>) |
| | >Re: Panther, sRGB, web browsers (From: Uli Zappe <email@hidden>) |
| | >Re: Panther, sRGB, web browsers (From: Chris Murphy <email@hidden>) |
| | >Re: Panther, sRGB, web browsers (From: Uli Zappe <email@hidden>) |
| | >Re: Panther, sRGB, web browsers (From: Chris Murphy <email@hidden>) |
| | >Re: Panther, sRGB, web browsers (From: Uli Zappe <email@hidden>) |
| | >Re: Panther, sRGB, web browsers (From: Chris Murphy <email@hidden>) |