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: Nipat Paiboonponpong <email@hidden>
- Date: Sat, 17 Oct 2009 06:40:01 -0700 (PDT)
It would be good if we could paint into screen area as a mask
to compensate for the non-uniformity.
Nipat
----- Original Message ----
From: Klaus Karcher <email@hidden>
To: colorsync-users <email@hidden>
Sent: Fri, October 16, 2009 10:45:21 PM
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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