Re: Monitor calibration software for OS9 computer
Re: Monitor calibration software for OS9 computer
- Subject: Re: Monitor calibration software for OS9 computer
- From: "J.Raimar Kuhnen-Burger" <email@hidden>
- Date: Fri, 18 Sep 2009 22:27:55 +0200
- Thread-topic: Monitor calibration software for OS9 computer
We do swap displays and profiles in a testing lab here every day. One of the
conclusions of doing this since the end of the 90s is that when using a pure
digital connection, the signal stays the same - whatever computer or
platform is used. Digital connections do not work with voltage signals and
digital-analog conversions and the signaling sequence is clearly defined. It
doesn´t matter if bits/bytes are transferred at slightly different voltage
levels - the byte sequence will be same. Using an analogue display - in
contrast - will give some differences as the video cards (even the same
type) differ slightly in their drivers, voltage signals and d/a conversion.
And this will give a visible change in color and appearance.
It depends on the type of connection and not on the video card or display if
a profile swap is valid or not. Therefore creating a profile on one system
and transferring it to another is a valid way with a dvi-d / adc / hdmi /
displayport connected display. So with an anlogue connection, recalibrate
under OS 9 with tools that still run there. In digital mode, create a
profile on a more recent platform and just copy the profile.
Hope that helps
Raimar
am 18.09.09 21:03 schrieb email@hidden unter
email@hidden:
> Von: Scott Martin <email@hidden>
> Datum: Fri, 18 Sep 2009 08:14:27 -0500
> An: ColorSync Forum <email@hidden>
> Betreff: Re: Monitor calibration software for OS9 computer
>
>
> On Sep 17, 2009, at 10:49 PM, Marco Ugolini wrote:
>
>> Is there actual evidence which demonstrates convincingly and
>> conclusively that substituting one video card for another on a given
>> CPU attached to a given monitor always and inevitably changes the
>> signals that are sent to the display in a way that is clearly
>> perceived by an observer with average color perception?
>
>
> I've been traveling around calibrating displays for hire since 1994
> (well before colorimeters were used) and I've seen it again and again.
> I calibrate someone's display, they swap out the video card and things
> are obviously different. I've also seen DVI video cards swapped out
> and I've run CEDP's verification to confirm that re-calibration wasn't
> needed. So sometimes a profile is valid across different video cards
> and sometimes it isn't. It may very well be that DVI connections are
> video card independent but until I know otherwise I'll encourage
> clients to re-calibrate when any portion of their display system
> (monitor, video card *and* cable) is changed.
>
> Scott Martin
> www.on-sight.com
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