Re: HP Dreamcolor: does the bad dream recur?
Re: HP Dreamcolor: does the bad dream recur?
- Subject: Re: HP Dreamcolor: does the bad dream recur?
- From: "dpascale" <email@hidden>
- Date: Fri, 16 Oct 2009 14:50:20 -0400
Hello Klauss,
More greenish on sample 1 and more reddish on sample 2.
I see this difference on a (much) lower cost.display, which must add some of
its own non-uniformity, but if my judgment matches yours, then my display is
not that bad! However, this is not something I would expect from your
display.
Hopefully somebody from HP will comment.
Danny
----- Original Message -----
From: "Klaus Karcher" <email@hidden>
To: "colorsync-users" <email@hidden>
Sent: Friday, October 16, 2009 11:45 AM
Subject: HP Dreamcolor: does the bad dream recur?
Hello List,
almost exactly one year ago, I reported about the replacement of my
(then brand new) HP Dreamcolor panel. The replacement panel successfully
solved the uniformity issues me and others complained about. I wrote on
October 19, 2008:
I contacted HP Europe on Thursday and got a new panel (head) on
Friday. The new one is almost perfect: Under normal viewing
conditions one has to try hard to see any non-uniformities. When one
displays dark grays in a completely darkened environment and hides
everything else (Menu bars, palettes and so on) one will see very
slight, horizontal lightness variations but no color casts.
In matters of uniformity the new HP Dreamcolor panel clearly beats
every other wide gamut display I've seen so far
I felt very comfortable with the replacement panel and successfully
finished many very color-critical jobs with it, whereas there were few
jobs that demanded for very high uniformity lately -- until yesterday,
when I started a job where I have to balance very subtitle color and
lightness casts in huge fabric scans. I didn't worry about the slight
red-green casts I saw in a plain-colored beige fabric when I opened the
scan -- but this changed abruptly when I noticed that the color casts
stayed on the same position while I scrolled though the scan!
I hoped the effect would dissapear after some warm up time, but it didn't.
To illustrate the issue, I created an image in Photoshop's full screen
mode. It balances the color casts of the display, i.e. it looks almost
uniform to me when I view it in full screen mode at 100%. You can download
it here
<http://digitalproof.info/colorsync-users/HP_nonuniformity16Okt09.tif>
(LAB TIF, 5,4 MB). The most different areas measure Lab 81/0/7 and 80/3/8
(Delta E 76: 3.3, Delta E 2000: 4.2).
What do you think about it? Do you think such uniformity differences are
acceptable for a high end display? Did other Dreamcolor users notice
similar worsening in the course of time?
Thanks in advance,
Klaus Karcher
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