[argyllcms] AW: Re: AW: List of wide gamut displays
- From: "Jens Heermann" <argyllcms@xxxxxxxxxxxxxxx>
- To: <argyllcms@xxxxxxxxxxxxx>
- Date: Thu, 13 Oct 2011 16:40:03 +0200
The question is not the availability of a particular feature, but the
possibility to use it.
Hardware calibration offers the possibility to make corrections directly in
the monitor controller and to adjust the internal LUT (look-up-table). This
LUT offers a resolution of 14-16bit, in the newest models even 10-14bit per
channel (RGB, 3D-LUT), which means that you have up to 16384 (14bit)
supporting points for a correction instead of 256 (8bit) as you have in the
video card, due to limitations of the OS. This can lead i.e. to massive
tearing in gradients.
The other thing is: while calibrating your device to a specific condition
(i.e. whitepoint D50), you have to "deform" the original gamut to fit the
desired target. 8bit-calibration will limit the range for modification and
corrections and will definitely shrink the gamut to nearly 2/3 of the
original.
Also the backlight is often not optimized for D50 and therefore
print-related tasks, therefore you will lose much of the gamut to the
deformation towards D50. This is mainly the reason why LCD-TVs cannot be
used for high-quality softproofing. Their backlight is optimized to video
standards, not to print standards.
So, the only way to preserve most of the technical possible gamut offered by
the panel is to perform a hardware calibration.
Regards
Jens
Von: argyllcms-bounce@xxxxxxxxxxxxx [mailto:argyllcms-bounce@xxxxxxxxxxxxx]
Im Auftrag von ???? ????
Gesendet: Donnerstag, 13. Oktober 2011 16:06
An: argyllcms@xxxxxxxxxxxxx
Betreff: [argyllcms] Re: AW: List of wide gamut displays
For softproofing can be used every display, that have gamut larger than
particular printing process. Coated paper have bigger gamut in cyans than
typical sRGB display while most wide gamut monitors cover coated paper
gamut.
Which criteria make Dell, HP and NEC widegamut displays not suitable for
softproofing??
2011/10/13 Jens Heermann <argyllcms@xxxxxxxxxxxxxxx>
Hello list,
please be advised, that "wide gamut" is not everything. For
high-end-softproofing only monitors, that can be hardware-calibrated (direct
access to the internal LUT of the monitor) can be recommended.
Therefore I would exclude those Dell and HP models, as well as all Apple
Cinema Display. They may feature a wide gamut, but it will shrink
significantly when these models will be calibrated via a
"software-calibration", which only offers 8bit resolution for grey steps,
due to fact, that the corresponding curves will be stored in the graphics
card and that the correction will also be done in the ICC profile.
Therefore the wide gamut of those displays is merely a marketing argument
but not worth a lot in the reality.
As a developer of a high quality softproofing solution and consultant in the
colormanagement field we only recommend the EIZO ColorEdge-series, the NEC
SpectraView (Reference)-series and/or the QUATO IntelliProof-series to our
customers.
A good guideline for the "right" monitor are the criteria of the "Fogra
Softproof Pre-Cert". Only monitors which can fulfill the criteria of the
category "A" are suitable for softproofing.
Regards
Jens Heermann
Von: argyllcms-bounce@xxxxxxxxxxxxx [mailto:argyllcms-bounce@xxxxxxxxxxxxx]
Im Auftrag von ???? ????
Gesendet: Freitag, 7. Oktober 2011 23:47
An: argyllcms@xxxxxxxxxxxxx
Betreff: [argyllcms] List of wide gamut displays
Hi everyone.
I'm using colorimeter on many models of displays and it will be very useful
have ccxm matrix for every wide gamut display available on market.
Let's try together make complete list of wide gamut display models.
Try to begin:
1. Dell UltraSharp U2410
2. NEC 2490Wuxi2 and NEC 2690Wuxi2
3. HP LP2475w
Sorry for my english.
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