RE: [Lcms-user] Re: [Lcms-user][OpenICC] vgct tags

[Greg S. <gre...@co...>]

I too would like LCMS to support monitor calibration. (although I don't =
care
how and where it stores the calibration data - just as long as there is =
a
means to load the data into the graphics card)=20

Having said this I understand the reasons why it doesn't, and may never
support calibration. But it'd be nice. :) :)

Greg.

-----Original Message-----
From: lcm...@li...
[mailto:lcm...@li...] On Behalf Of Stefan =
D=F6hla
Sent: Tuesday, 18 October 2005 03:51
To: Lcms Liste
Subject: Re: [Lcms-user] Re: [Lcms-user][OpenICC] vgct tags



>> I have to add a very important item: The profiles, created with
>> ProfileMaker, basicccolor display, Monaco, ... do include the vcgt =
and
>> are not containing valid device characterization if the vcgt is not
>> taken into account. This does mean, that an ICC-lib should support

> This is an OS issue. Independent of an CMM.

>> vcgt tags, as they are required to correctly apply the data of
>> these profiles (which are most likely the majority).

> Again an OS issue. The profile attached to an screenshot image is=20
> completely valid in the sense of the ICC spec. Why would someone need =
the
> linearisation data of an printer, With the Cmyk ICC profile a =
separated
> image is completely described, as it can be converted to pcs.

What I wanted to say is simply: You should not ignore these tags
completely, since they are accidentaly very powerful. E.g. changing
the whitepoint with a vcgt tag is fairly easy, so don't apply it and
all data contained in the profile is invalid.

You are right in terms: it's the responsibility of the OS to apply
these changes. But there's no better/cleaner way for now to say that
certain calibration data lead to a certain profile (at least it's the
impression when looking at all the commercial profilers).

Stefan

--=20
Stefan D=F6hla
mailto:co...@do...



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