Re: Dreamy picture (Dreamcolor monitor)
Re: Dreamy picture (Dreamcolor monitor)
- Subject: Re: Dreamy picture (Dreamcolor monitor)
- From: Klaus Karcher <email@hidden>
- Date: Mon, 20 Oct 2008 01:04:04 +0200
Roger Breton wrote:
Guten abend Klaus,
Guten Abend Roger :-)
Are you going to have some time (?) to quantify its uniformity? Maybe
something along the SWOP's new monitor requirents? See BabelColor's
CT&A ISO 12646 targets here :
http://babelcolor.com/main_level/screen_shots/Spectral_Tools_ISO2.htm
Maybe the UDACT software also does this?
The UDACT uniformity test uses 9 patches and 3 luminance levels (I guess
it also uses the ISO 12646 brightness target). The maximum deviation for
the luminance is 10% from the center to the 8 points around. It also
calculates Delta C, but the result is only informative. I don't have the
UDACT software, but I guess that even the old panel would have passed
the test: I measured 11% luminance deviation and Delta C 6.9 *between
the two most objectionable spots*. The uniformity according to the UDACT
tool would have been certainly better as none of the spots exactly met
the UDACT measurement points.
In matters of uniformity the new HP Dreamcolor panel clearly beats
every other wide gamut display I've seen so far (and I've seen
almost all available models). It is at least as uniform as the
"narrow-gamut" EIZO CG210 and much better than the newer EIZO
"Digital Uniformity Equalizer" models (CG211, CG221, CG241).
Much better? I would like to believe your subjective judgement,
Klaus.
And it comes back to my above suggestion of using the ISO-12646
target to quantify its uniformity in terms of luminance and
chromaticities.
I'd be interested to compare with the Eizo CG21 I have here (I won't
dare show the figures for my Samsung...).
I'll take some measurements next week and will report on the results.
What kind of Luminance are you calibrating it at? And have you got a
custom colorimeter and just a regular EyeOnePro? Have you tried it
with Argyll?
I calibrated it to 160 cd/m2 and D50 using an eye-one pro and Argyll.
There is unfortunately no L* preset and there are no separate RGB
controls in the OSD. One can adjust the color temperature in 100K steps,
but D50 is not exactly on the predefined locus according to my eye-one
Pro. Therefore I had to accept compromises regarding white point and TRC.
I either have to order the HP profiling kit, wait until basICColor
supports hardware calibration for this display or try to gain access to
an HP SDK for it and write my own software (I mostly go for the latter :-)
Under normal viewing conditions, the HP Dreamcolor is close to
perfection: It has very little viewing angle dependency, great
uniformity and an unbeatable gamut and contrast range. I can highly
recommend it.
Wunderbar!
However, it borders to wastage to drive it with only 8 bits per
channel, all the more as there is no L* TRC preset. I wonder if a
new MacBook Pro with Display Port would exhaust its 10 bits per
channel capability?
Do you have access to a PC? With
one of those Matrox 10 bits board?
unfortunately no.
Does the HP DreamColor accept a DisplayPort connection?
of course:
Andrew Page wrote:
To the 10-bit question that's come up, you do need a 10-bit
enabled card and software. The "easiest" way to implement the
10-bit path for is through 10 bit, or floating point, textures in
the OpenGL path. DisplayPort is the recommended path to get 10
bit data into the card.
If anyone would like to borrow (or donate ;-) me a new MacBook Pro, I'd
be happy to test it with the HP Dreamcolor and even write a simple
OpenGL image viewer if necessary.
Klaus
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