Re: Dreamcolor uniformity issues...
Re: Dreamcolor uniformity issues...
- Subject: Re: Dreamcolor uniformity issues...
- From: Grant Symon <email@hidden>
- Date: Fri, 13 Mar 2009 23:07:49 +0100
Thanks to all for the replies.
I think that I have a better idea now about exactly what the issues are.
I'm afraid Tom, that I have to agree with Edmund. HP definitely
talked about this display as being wonderful for colour work. I love
the display ... I've been working with it now for several months ...
but ... but ... but ... when you are in the situation of having to
shift an image around on screen, to try to work out what is exactly
the colour ... pinkish/greenish ... then there is simply no way that
you can claim it's good for accurate colour work. Basically, I'm back
to 'guessing'. Sure, it's an inspired guess. But it's still a guess.
If I can't get a better panel from HP, I'm going to have to drop it.
Shame.
The one replacement we have had, was clearly a 'refurb'. In other
words, they sent us one that had already been returned. How do I
know? Manufacture date of July08. Installed firmware was released in
Nov08. Bit of a giveaway. Shame on them really.
Grant
On 13 Mar 2009, at 21:02, tl wrote:
Hi to all,
I thought that I should chime in here because this discussion is
getting out
of hand. First the type of issues being reported here are the
result of
differences on the order of 2-4 delta E. This at least a factor of
three
times less than most CRT monitors and more importantly this probably
better
than the color drift error on most color sensors used in imaging.
If you
want to see a sobering example of the state of the art, point your
expensive
dSLR into the port of a calibrated integrating sphere. The problem
with LED
backlights is that the color errors result generally in the green
LED which
can drift in dominant wavelength as much as .5nm/degree. The result
is a
display that seems to have some low frequency bands in the green-
magenta
directions.
If you take one of these monitors, fill the field with a white image
and
stare at it, you will actually see the field change as you stare at
it.
That's simply a function of real, but small changes in the field and
product
of our adaptation. When viewing the full screen gray you are
viewing an
extended field. For large fields, one would use the 10 degree color
matching functions which are quite different than the 2 degree
observer.
When you put an image on that display, you are using a different
mode for
evaluation and you will not really see 2-4 delta E difference under
the
image. You can perform extremely critical color evaluations on the
display
because you are using local adaptation as you are making the
adjustment.
When you consider the display's ability to handle gradients, display
a wide
gamut, and have a wider dynamic range than nearly any other display
on the
market, a small amount of lack of homogeneity is not an overwhelming
problem. Once you actually use one and compare the display to the
printed
page, in a properly color managed environment, you will be pleasantly
surprised. By the way, print out a full grey page on your printer.
I think
you will see that the display is not a limiting factor in
uniformity, it's
just easier to critique.
Regards,
Tom Lianza
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