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Re: Monitor profiling - what is 'correct'
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Re: Monitor profiling - what is 'correct'


  • Subject: Re: Monitor profiling - what is 'correct'
  • From: Roger Breton <email@hidden>
  • Date: Fri, 16 Feb 2007 20:05:58 -0500

Tom,

I appreciate reading your thoughts on display metrology :-)

> Large shifts from the native color
> temperature will often lead to compromises in the calibration ability of
> the display/display card  combination.

"Often" as in making things statiscally worse? You compare characterizing
with calibration and without calibration?

> Large deviations from the native
> gamma of the display will often lead to problems in the reproduction of
> gray ramps.

Again, the same argument as above, I guess.

> So as a general rule of thumb: the less "calibration" you
> need the better the final image of the display will be.

Depends, no? Ideally, displays should be made with a specific application in
mind. So that little if any calibration would be required on the part of the
user. But is that realistic, Tom : doesn't seem to me that this is how the
bulk of monitors are manufactured. My point is, yes, less calibration imay
be better in terms of preserving the integrity of a display but, in
practice, I don't see what the alternatives are? IMO, some amount of
twisting must be performed, in order to obtain the desired color appearances
from these "general-purposes" monitors. Or have I got this wrong?

Take, for example, the Apple 30" Cinema Display. Imagine a press proofing
system with this monitor right by a press console: would you leave it in its
raw "uncalibrated" state, at around 6600K, and expect to get matcheable
colors for the press to hit on it? On a substrate showing a* = 0.5 and b* =
+3?

> In my own experience with on-screen proofing, the single biggest issue has
> been building the profile with the proper black point in the LUT description.

Could you expand just a little here?

> Tom Lianza

Roger Breton  |  Laval, Canada  |  email@hidden
http://pages.infinit.net/graxx


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