Thread: [Lcms-user] Re: Degrees of freedom
An ICC-based CMM for color management
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From: Roger B. <gr...@vi...> - 2004-04-18 13:33:57
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> For printer calibration, usually not an IT8 scanner target is used, but > different targets. For a very good printer profile, you may need a > target with >= 1000 (up to a few thousands) patches, particularly for > CMYK profiles, due to the additional degree of freedom. > Gerhard Gerard, Could you explain, briefly, the 'degree of freedom' in the case of CMYK profiling? Do you mean it in statistical terms? In the context of Chi-square? Regards, Roger Breton | Laval, Canada | gr...@vi... http://pages.infinit.net/graxx |
From: Gerhard F. <nos...@gm...> - 2004-04-18 14:13:28
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Roger Breton schrieb: >>For printer calibration, usually not an IT8 scanner target is used, but >>different targets. For a very good printer profile, you may need a >>target with >= 1000 (up to a few thousands) patches, particularly for >>CMYK profiles, due to the additional degree of freedom. >>Gerhard >> >> > >Gerard, > >Could you explain, briefly, the 'degree of freedom' in the case of CMYK >profiling? Do you mean it in statistical terms? In the context of >Chi-square? > Roger, I mean it in a very generay way, see the following definition: http://mathworld.wolfram.com/DegreeofFreedom.html I.e. four colorants -> four parameters which must be independently varied for generating the target patches. Regards, Gerhard |