Re: fundamental question - monitor profile as working RGB?
Re: fundamental question - monitor profile as working RGB?
- Subject: Re: fundamental question - monitor profile as working RGB?
- From: Chris Murphy <email@hidden>
- Date: Tue, 9 Dec 2003 17:46:57 -0700
On Dec 9, 2003, at 4:53 PM, Graeme Gill wrote:
Chris Murphy wrote:
I'd like to know what apps are creating display profiles that do not
assume the display is gray balanced. Any volunteers?
Any useful profiling package, cannot afford to assume that a device
behaves in a particular way (for instance that R=G=B -> a*b* = 0.0).
If you know any profiling packages that assume that a monitor is
grey balanced, let us know which ones, so that they can be avoided at
all costs ...
MOST of them assume the display is gray balanced post calibration. That
is they calibrate, and then assume that the calibration was 100%
successful in gray balancing the display, therefore the profile itself
reports R=G=B as being a*=0 and b*=0.
Of the top of my head, Color Vision does this (unless you ask for
Profile only, with no calibration) with both of their products; Gretag
Macbeth unless you built a Large profile; previously mentioned Sony
Artisan; and both Adobe Gamma and Apple's Display Calibrator. I'm
pretty sure this is also the case with Monaco Optix and basICColor
display but don't have profiles handy from either product at the
moment.
Like Bruce, I'd prefer to see the video card LUT be linear, go with
native display gamma, and compensate for it in the CMS since it's being
hammered for display compensation anyway. At least those conversions go
through 20-bits/channel of precision in Adobe products. But to suggest
that every product that assumes displays are gray balanced post
calibration should be avoided at all costs is pretty silly considering
most of them do it.
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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