Re: Two Displays, One Graphics Card, Two Profiles, Which Profile wins?
Re: Two Displays, One Graphics Card, Two Profiles, Which Profile wins?
- Subject: Re: Two Displays, One Graphics Card, Two Profiles, Which Profile wins?
- From: Peter Karp <email@hidden>
- Date: Mon, 7 Feb 2005 11:23:13 +0100
>>After profiling, the two displays still look different. I have a
>>the same photo as a background on both displays, and the colors are
>>slightly different.
> right... well... let's talk about that a bit. If you are talking
> about desktop pictures I'm not sure that the OS color manages them.
I tested under OS X (10.3.7). It does not. The preview in the Finder
and the desktop is _not_ colormanaged, while the preview application
of Mac OS X is colormanaged.
I created a test monitor profile
www.karpfenteich.net/colorful/MonProfTest.zip
where the X and Z channels are interchanged. (X and Z channels loosely
correlate with Red and Blue). So you'll see totally weird looking
pictures if the monitor profile is correctly used by an application.
Flesh tones look bluish then. You can use this profile, so that even a
"blind man" will see if the application uses a monitor profile
correct. You can also use this matrix profile to check if LUT based
profiles are recognized by an application, or at which time the
monitor preview is refreshed by an application. For example Photoshop
refreshs whenever PS gets the focus, while the Mac OS X preview
application needs a restart (of the application itself) to update to a
new choosen monitor profile.
> At 1:18 PM +0100 2/4/05, Peter Karp wrote:
>>
>>Lower-priced colorimeters and spectrophotometers (I mean all the usual
>>devices like the DTP-series, the EyeOne series, the Spyder...) use a
>>not too sophisticated "filter system" which can not truly describe the
>>CIE 1931 standard observer color matching functions.
> In the case of spectrophotometers this is not true.
> Spectrophotometers do not use a filter system
Yes, that's why I wrote "filter system" in quotation marks. But also a
low resolution spectrophotometer will not output accurate tristimulus
values (for the CIE 1931 standard observer) in all cases. You'll have
a variance between different typical used measurement devices like the
mentioned ones. The variance depends on the actual device and the
display type. What I wanted to say was, that the measurement itself
is not too unlikely to introduce some kind of variation between
different display types, because we can not really measure "color" in
the sense that color is a perception. ('hope I'v choosen the right
words, so you understand what I'm trying to say :-)
Best regards
Peter
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