Re: Monitor calibration software for OS9 computer
Re: Monitor calibration software for OS9 computer
- Subject: Re: Monitor calibration software for OS9 computer
- From: José Ángel Bueno García <email@hidden>
- Date: Fri, 18 Sep 2009 23:47:48 +0200
Are so kind to tell something about LUT?
Two years reading the same song on profiling displays and buying
software only for device aging?. It can be enought in the pursuit of
managed colors in my environment, but is hard to assume. Or I have
loose any (big) lesson?
2009/9/18 J.Raimar Kuhnen-Burger <email@hidden>:
> 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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