Thread: [Lcms-user] Re: I should like ..
An ICC-based CMM for color management
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From: <ma...@li...> - 2001-06-19 15:18:32
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Hi Bernardo, > Which is the color appearance model implemented in lcms? None. The appearance model is embedded into profiles. Each profile is responsible of any corrections form its specific viewing conditions to the profile connection space (PCS) Appearance models like CIECAM97s can be found on profilers, instead of CMM. We are for now working on this subject :-) > Which are the techniques for colorimetric corrections in lcms? It depends of intent used. On perceptual ones, the CMM is not adding any correction, since is using the "dumb cmm/smart profile" approach. In absolute colorimetric intents, there is a black point/white point linear scaling, as suggested by current icc spec. So, mainly no correction at all. But there is a function, cmsCreateRGBProfile() that builds profiles in the fly. This one (and only this one) is using a simplified Bradford transform for chromatic adaptation. > When I use your lcmslabi.icm as output profile, Which is the illuminant (D50 > or D65) for the obtained lab values? lcmslabi.icm is using D50. This white point is widely used on prepress and other programs (PhotoShop, for example). Note also that only absolute colorimetric intents will keep source profile white point unchanged. Marti. ----- Original Message ----- From: "Bernardo Pucci" <cyb...@ti...> To: <in...@li...> Sent: Tuesday, June 19, 2001 11:34 AM Subject: I should like .. > Dear Maria, > I' m Bernardo the italian student.You'll remember? > I should like to ask you 3 questions. > Which is the color appearance model implemented in lcms? > Which are the techniques for colorimetric corrections in lcms? > When I use your lcmslabi.icm as output profile, Which is the illuminant (D50 > or D65) for the obtained lab values? > > Thanks and I hoping to hear from you soon. > Bye Bernardo > > > > |