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

[Kai-Uwe B. <ku...@gm...>]

Am 15.10.05, 14:36 +0200 schrieb Stefan D=C3=B6hla:

> 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=
=20
linearisation data of an printer, With the Cmyk ICC profile a separated=20
image is completely described, as it can be converted to pcs.

> On the other hand, this does mean, that this information belongs
> somehow to the profile. I must admit, that it's not right to include
> the actual calibration data instead of the desired device response.

My impression is, the profilers do embedd a device response information=20
due to the lack of standardisation.
I hope to come up soon with an draft about an file format, suitable to=20
include both ICC compliant information and device configuration=20
information. I need it in Oyranos as devices are not solved.

> Oh, and becaus of this I would vote for vcgt support in LCMS to
> support these legacy profiles (and operating systems ;-)

regards
Kai-Uwe Behrmann
                                + development for color management=20
                                + imaging / panoramas
                                + email: ku...@gm...
                                + http://www.behrmann.name