[argyllcms] Re: widegamut LCDs and internal LUT

Alexandre Prokoudine wrote:

Hi,

I'm choosing between EIZO FlexScan SX2461W and LaCie 324 for a new
workstation (mostly photography). I read the thread on internal LUT
support from February'08 (in this mailing list) and it looks like no
open source software is still able to talk to guts of widegamut LCDs
via DDC.

So, three questions:

1. How correct would be color reproduction on a modern Linux system
with such a display (if I have a, say, Intel X3100 with XRandr 1.2
support). What artifacts will I see? Staircase in gradients? Shifted
hues?

2. From what I can see xcalib/xicc cannot work with displays inner
LUTs as well. How do I work around it? Do I work around it at all?

3. Are there any news regarding what I misleadingly call "support for
internal LUT"? :-) And is there anything I could do to help improving
the situation (sending a display to Graeme is not an option at this
time, sorry)?

Alexandre
I just want to forward a mail from Rick Hatmaker (chromix) Re the new HP LP2480zx Wide Gamut Display. It has an internal color engine to emulate generic color spaces like Adobe RGB. The internal processing works with high color depth and it also accepts 30bpc data via DisplayPort. HP sells an "Advanced Profiling Solution (Calibration Kit)" for Win+Mac and -- most important -- "Linux support is planned through an open source project" :-) 

Klaus
--- Begin Message --- 
Bob, Lorenzo, et al:
The LP2480zx certainly is impressive. Here is what we know about the calibration package for the HP DreamColor LP2480zx so far: 

Product wording from HP:
· KZ300AA Advanced Profiling Solution (Calibration Kit) At $349 this LCD monitor option is designed for professional users who require precision color accuracy in their work output. It allows users to quickly and accurately calibrate monitor front-of-screen settings to prevent any drift of critical monitor color or whitepoint settings. The kit contains a colorimeter and related software (for both Microsoft® Windows® and Apple Mac OS X; Linux support is planned through an open source project) that provides a number of options for display calibration (whitepoint, gamma, and luminance). 

Our further investigation reveals:
- the colorimeter is an Eye-One Display 2 enhanced to sense the wider range of the DreamColor - the HP calibration software does allow more intimate digital functional control over the monitor (than a 3rd party product), and allows storage of the data to the higher bit-depth LUT memory on the monitor. 

Certainly other questions exist:
-       does the HP software work with other sensors?
-       will an emissive spectrophotometer (i.e.,: i1Pro) be effective?
-       what are the other functions available in the software?
We will be getting the KZ300AA Calibration kit soon to test on our LP2480zx and will report our findings. 


Rick Hatmaker
hatmaker@xxxxxxxxxxx





On Sep 24, 2008, at 4:01 PM, Robert Rock wrote:


Lorenzo,
I don't think it's available yet. Rick Hatmaker got us these displays and 
advised that both the hood and the calibration package are not yet
available, but Chromix has them on order. He will let me know when they are 
in. I used ProfileMaker with my eye-one display2.

Bob

-----Original Message-----
From: Lorenzo Ridolfi [mailto:lorenzo@xxxxxxxx]
Sent: Wednesday, September 24, 2008 6:47 PM
To: 'Robert Rock'; ''colorsync-users?lists.apple.com' List'
Subject: RE: HP Dreamcolor Display: So far, so good.

Hi Bob,
Nice manual, with a clear description of the color path in the monitor? Did you get the HP/Xrite software to adjust the internal LUT? This software may 
give you smoother tones than PM5.

Best regards,
Lorenzo

-----Original Message-----
From: Robert Rock [mailto:bobrock@xxxxxxxxxxxx]
Sent: quarta-feira, 24 de setembro de 2008 19:22
To: 'Lorenzo Ridolfi'; ''colorsync-users?lists.apple.com' List'
Subject: RE: HP Dreamcolor Display: So far, so good.

Lorenzo,
Yes, it does have a high-resolution LUT, and I did NOT notice any banding on my screen whatsoever. Not even a hint. Here's the User Guide if anyone is 
interested:

http://www.bobrock.com/POTN/HP_LP2480zx_UserGuide.pdf



Bob



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