Re: LaCie blueeye
Re: LaCie blueeye
- Subject: Re: LaCie blueeye
- From: "tom lianza" <email@hidden>
- Date: Sun, 16 Jun 2002 21:19:28 -0400
Hello to all,
I wanted to comment on the following exchange:
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>
From: David Foster <email@hidden>
.. The display does not
>
represent the color values accurately - this is most obvious when the
>
monitor displays a gray ramp (we've used the white balance file from Hutch
>
Color as well as one of our own.) The most peculiar thing is that each
>
individual stripe of (allegedly) neutral gray is different from it's
>
neighbor by a striking degree.
I have had this same problem with 2 Lacie's and a Mitsubishi. Three
different monitor profiling apps with two different measuring devices
give the same results. Very near neutrals that are critical display
incorrectly as well, making visual determinations about them impossible.
At least I see I'm not alone with this problem. I suspect it's another
one of those "this all works if you're not picky" issues.
Tyler
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I read these responses with particular interest and I wanted to provide some
comments
as an engineer who is well versed in the display area. It is difficult to
believe that displays from either LaCie or Mitsubishi exhibit the degree of
differential non-linearity that is described in these discussion. The fact
that near neutrals may be globally off is easy to understand, but the fact
that two adjacent digital gray patches exhibit obviously different hues is
probably not the fault of the monitor, unless the monitor is driven via a
DVI interface. A very common problem that causes this artifact is
differential non-linearity or missing codes in the graphic cards output
Digital to analog converter. It is hard to imagine a situation where an
analog monitor would behave in such a discrete manner, and I can understand
the skeptisim of the display manufacturers especially given their knowledge
of the graphics card situation. This problem would manifest itself most
visibly in the middle and lower portions of the luminance range. It is
particularly striking if you have the display set to "thousands of colors"
rather than "millions of colors" . Tylers phrase "this all works if
you're not picky", really describes the graphics cards industry to the
letter. The output of cards varies quite a bit and the quality of the
output Digital to Analog converter is not a tested parameter on every card
and certainly not tested by the computer vendors that supply them.
Tom Lianza
Sequel Imaging Inc.
25 Nashua Rd
Londonderry, NH 03053
>
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