Re: Spectro vs. Colorimeter
Re: Spectro vs. Colorimeter
- Subject: Re: Spectro vs. Colorimeter
- From: Graeme Gill <email@hidden>
- Date: Wed, 01 Oct 2008 10:08:19 +1000
email@hidden wrote:
The DreamColor display and other displays that use RGB-LED backlight are particularly
challenging to calibrate. The problem arises because the Green LED has a center
wavelength in the 520-530 nm range. The leading edge of the emission spectra is very
close in shape and location to the leading edge of the Y color matching function.
Hi Tom,
doesn't this imply that the display itself is going to suffer from
worse than usual observer metameric failure ?
I would rely upon an i1 or Munki to have the precision to make this measurement with
any certainty, but they would probably measure closer to the PR650 than the CS1000.
How about in 3.3 nm rather than 10nm mode though ?
One should also note that the same factors that make the measurement difficult, also
enhance the probability of observer metamerism. It will be interesting to see if this
is a factor in print to screen matching. In this case you could have two observers
disagree on the screen image match.
Right.
generation is trivial for your average color scientist, programming that lut into the
display requires a great deal of very undocumented DDC interaction. Any third parties
would have to have a very strong working relationship with HP. It's a lot of work.....
If any of you have requests for features for the DreamColor line, you should contact
HP and request them.
The DDC interfaces to the operating systems are pretty rough to begin with,
so an undocumented, convoluted protocol doesn't help. Perhaps they
should have used USB like the EIZO.
Graeme Gill.
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