Re: Ooops - D65 != D65 ???
Re: Ooops - D65 != D65 ???
- Subject: Re: Ooops - D65 != D65 ???
- From: Steve Upton <email@hidden>
- Date: Tue, 19 Jun 2007 10:04:42 -0700
At 2:59 PM +0200 6/19/07, Uli Zappe wrote:
>Am 19.06.2007 um 12:52 schrieb Robert Rock:
>
>>So for many of us less technically proficient readers out here, is it suggested that we should ALWAYS use the D50 setting and NOT the D65 setting when creating our display profiles? For some reason I thought I recall
>>reading in another discussion that the general trend now is calibrate all displays to 6500 degrees (D65), NOT the graphic arts standard of D50. I'm a little confused.
>
>Well, at least in this thread nobody said you should always use D50; the point that you probably refer to is a technical one: version 4 of the ICC specification says that in ICC profiles, *internally* values should be stored relative to a D50 white point, so that using white points other than D50 means the values must be transformed before they are written into the ICC profile. This is like defining the origin of a coordinate system and not a recommendation for actual settings.
that's about the clearest explanation of the purpose of D50 that I have read so far. kudos
>>Second question, should I be using the "native white point" of my display, as I've heard many suggest,
>
>Others in this list are much more experienced than I am; all I can say is that at least using the native white point does not solve the inconsistency issues I'm experiencing, so this wouldn't be a reason to stick to it.
right. I personally feel that matching the display white point to the 'ambient white point' is the best course of action - if you have the ability to do so. With CRTs we had the ability. With white-point-tunable LCDs we have the ability. With normal LCDs we have the ability but it is a non-optimal solution as we are simply filtering the native white of the display, and losing brightness as a result. Thankfully LCD displays tend to be very bright and can stand to be dimmed a bit.
With non-tunable white point LCDs the optimal situation is to calibrate and use the display at its native white point and then ensure that your ambient lighting matches it, or at least is dim enough that it doesn't compete with it. Certainly not a trivial exercise for some work environments.
Also, Uli, if you haven't used ColorEyes Display Pro yet you should give it a serious look. The new version has a ground-breaking user interface and allows you to dig about as deep as you might want into the details and parameters of display calibration.
As far as instrumentation goes, yeah, there's tons of variation out there. I would recommend using the DTP-94 / Optix instrument (which is also available bundled with ColorEyes. It is the only colorimeter I know of that has internal temperature sensing to increase its accuracy. Another benefit of ColorEyes is that it supports a fairly wide range of instruments (except the Huey) so you can use one piece of software to compare different hardware.
Regards,
Steve
________________________________________________________________________
o Steve Upton CHROMiX www.chromix.com
o (hueman) 866.CHROMiX
o email@hidden 206.985.6837
o ColorGear ColorThink ColorValet ColorSmarts ProfileCentral
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