Re: [Lcms-user] cmsBuildTabulatedToneCurve16

[Marti M. <mar...@li...>]

Try this one I'm sending, you have to fill the copyright and description 
but all
remaining tags are ok

Regards
Marti

cmsHPROFILE CMSEXPORT cmsCreateOld_sRGB()
{
     cmsHPROFILE hICC;

     cmsCIEXYZTRIPLE Colorants = {{0.43607, 0.22249, 0.01392},
                                  {0.38515, 0.71687, 0.09708},
                                  {0.14307, 0.06061, 0.71410}};

     cmsCIEXYZ D65 = { 0.95045, 1, 1.08905 };
     cmsToneCurve* transferFunction;
     cmsFloat64Number Parameters[5];

     Parameters[0] = 2.4;
     Parameters[1] = 1. / 1.055;
     Parameters[2] = 0.055 / 1.055;
     Parameters[3] = 1. / 12.92;
     Parameters[4] = 0.04045;

     transferFunction = cmsBuildParametricToneCurve(0, 4, Parameters);

     hICC = cmsCreateProfilePlaceholder(0);

     cmsSetProfileVersion(hICC, 2.1);

     cmsSetDeviceClass(hICC,      cmsSigDisplayClass);
     cmsSetColorSpace(hICC,       cmsSigRgbData);
     cmsSetPCS(hICC,              cmsSigXYZData);


     cmsWriteTag(hICC, cmsSigMediaWhitePointTag, &D65);

     cmsWriteTag(hICC, cmsSigRedColorantTag,   (void*) &Colorants.Red);
     cmsWriteTag(hICC, cmsSigBlueColorantTag,  (void*) &Colorants.Blue);
     cmsWriteTag(hICC, cmsSigGreenColorantTag, (void*) &Colorants.Green);


     cmsWriteTag(hICC, cmsSigRedTRCTag,   (void*) transferFunction);
     cmsLinkTag(hICC,  cmsSigGreenTRCTag, cmsSigRedTRCTag );
     cmsLinkTag(hICC,  cmsSigBlueTRCTag,  cmsSigRedTRCTag );


     // ... set the description and copyright here
     return hICC;
}



El 13/10/2012 17:16, Pascal de Bruijn escribió:
> Hi,
>
> We've switched from using cmsBuildParametricToneCurve to
> cmsBuildTabulatedToneCurve16 to stop Windows Photo Viewer from not
> showing our images.
>
> However, the resulting profile (with 1024 entries) quickly grows to
> about 7KiB in size.
>
> The original srgb.icc from HP is only about 3KiB in size...
> Considering the tables are 2KiB in size, I'm guessing the original
> srgb.icc only has a single table which all three tags (rTRC, gTRC,
> bTRC) refer to?
>
> Would a similar trick be possible when generating a TabulatedToneCurve
> using LCMS2?
>
> Regards,
> Pascal de Bruijn
>
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