Dreamcolor uniformity issues...
Dreamcolor uniformity issues...
- Subject: Dreamcolor uniformity issues...
- From: "tl" <email@hidden>
- Date: Fri, 13 Mar 2009 16:02:18 -0400
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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