Hi, Yes, that one. If you use cmsBuildGamma() you are forced to XYZ PCS, but if you use low-level you can use Lab PCS as well.
Regards Marti Maria The LittleCMS project http://www.littlecms.com -----Original Message----- From: Marco Freudenberger [mailto:marco.freudenber...@entrustdatacard.com] Sent: martes, 24 de mayo de 2016 16:14 To: Marti Maria <marti.ma...@littlecms.com>; 'Florian Höch' <lists+lcms-u...@hoech.org>; lcms-user@lists.sourceforge.net Subject: RE: [Lcms-user] How to create a gray profile with L-star grey response? Marti, sorry, I'm not sure I understand your answer. My intention is gray with L*, not Linear gray (Gamma 1.0), using the cmsBuildGamma would give me a gamma 1.0 response curve, though - at least when used with cmsCreateGrayProfile, right? Or am I missing something? Are you suggesting I'm creating the profile "low level"? Something like: cmsHPROFILE hProfile = cmsCreateProfilePlaceholder(ctx); cmsSetProfileVersion(hProfile, 4.3); cmsSetDeviceClass(hProfile, cmsSigDisplayClass); // or better abstract? cmsSetColorSpace(hProfile, cmsSigGrayData); cmsSetPCS(hProfile, cmsSigLabData); cmsSetHeaderRenderingIntent(hProfile, INTENT_RELATIVE_COLORIMETRIC); SetTextTags(hProfile, L"gray L-star") cmsCIEXYZ wpxyz; cmsxyY2XYZ(&wpxyz, WhitePoint); cmsWriteTag(hProfile, cmsSigMediaWhitePointTag, &wpxyz); cmsToneCurve* tc = cmsBuildGamma(ctx, 1.0); // 1.0 gamma from Lab = L* ??????? cmsWriteTag(hProfile, cmsSigGrayTRCTag, (void*)tc)); cmsFreeToneCurve(tc); -----Original Message----- From: Marti Maria [mailto:marti.ma...@littlecms.com] Sent: Dienstag, 24. Mai 2016 15:50 To: Marco Freudenberger; 'Florian Höch'; lcms-user@lists.sourceforge.net Subject: RE: [Lcms-user] How to create a gray profile with L-star grey response? Right, mark the PCS as Lab and use cmdBuildGamma(NULL, 1.0). You only need to add the white point and this curve. Marti Maria The LittleCMS project http://www.littlecms.com -----Original Message----- From: Florian Höch [mailto:lists+lcms-u...@hoech.org] Sent: martes, 24 de mayo de 2016 15:19 To: lcms-user@lists.sourceforge.net Subject: Re: [Lcms-user] How to create a gray profile with L-star grey response? Hi, Am 24.05.2016 um 15:07 schrieb Marco Freudenberger: > PS - to the group: I'm still wondering what would happen if I'd simply > set the TransferFunction to NULL... That would result in a gamma 1.0 response I think (according to the ICC spec). Florian. ---------------------------------------------------------------------------- -- Mobile security can be enabling, not merely restricting. Employees who bring their own devices (BYOD) to work are irked by the imposition of MDM restrictions. Mobile Device Manager Plus allows you to control only the apps on BYO-devices by containerizing them, leaving personal data untouched! https://ad.doubleclick.net/ddm/clk/304595813;131938128;j _______________________________________________ Lcms-user mailing list Lcms-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lcms-user ------------------------------------------------------------------------------ Mobile security can be enabling, not merely restricting. Employees who bring their own devices (BYOD) to work are irked by the imposition of MDM restrictions. Mobile Device Manager Plus allows you to control only the apps on BYO-devices by containerizing them, leaving personal data untouched! https://ad.doubleclick.net/ddm/clk/304595813;131938128;j _______________________________________________ Lcms-user mailing list Lcms-user@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lcms-user
