// Virtual profiles are handled here.
cmsHPROFILE OpenStockProfile(cmsContext ContextID, const char* File)
{
if (!File)
return cmsCreate_sRGBProfileTHR(ContextID);
if (cmsstrcasecmp(File, "*Lab2") == 0)
return cmsCreateLab2ProfileTHR(ContextID, NULL);
if (cmsstrcasecmp(File, "*Lab4") == 0)
return cmsCreateLab4ProfileTHR(ContextID, NULL);
if (cmsstrcasecmp(File, "*Lab") == 0)
return cmsCreateLab4ProfileTHR(ContextID, NULL);
if (cmsstrcasecmp(File, "*LabD65") == 0) {
cmsCIExyY D65xyY;
cmsWhitePointFromTemp( &D65xyY, 6504);
return cmsCreateLab4ProfileTHR(ContextID, &D65xyY);
}
if (cmsstrcasecmp(File, "*XYZ") == 0)
return cmsCreateXYZProfileTHR(ContextID);
if (cmsstrcasecmp(File, "*Gray22") == 0) {
cmsToneCurve* Curve = cmsBuildGamma(ContextID, 2.2);
cmsHPROFILE hProfile = cmsCreateGrayProfileTHR(ContextID, cmsD50_xyY(), Curve);
cmsFreeToneCurve(Curve);
return hProfile;
}
if (cmsstrcasecmp(File, "*Gray30") == 0) {
cmsToneCurve* Curve = cmsBuildGamma(ContextID, 3.0);
cmsHPROFILE hProfile = cmsCreateGrayProfileTHR(ContextID, cmsD50_xyY(), Curve);
cmsFreeToneCurve(Curve);
return hProfile;
}
if (cmsstrcasecmp(File, "*srgb") == 0)
return cmsCreate_sRGBProfileTHR(ContextID);
if (cmsstrcasecmp(File, "*null") == 0)
return cmsCreateNULLProfileTHR(ContextID);
if (cmsstrcasecmp(File, "*Lin2222") == 0) {
cmsToneCurve* Gamma = cmsBuildGamma(0, 2.2);
cmsToneCurve* Gamma4[4];
cmsHPROFILE hProfile;
Gamma4[0] = Gamma4[1] = Gamma4[2] = Gamma4[3] = Gamma;
hProfile = cmsCreateLinearizationDeviceLink(cmsSigCmykData, Gamma4);
cmsFreeToneCurve(Gamma);
return hProfile;
}
return cmsOpenProfileFromFileTHR(ContextID, File, "r");
}
cmsHPROFILE CMSEXPORT cmsCreateLab2Profile(const cmsCIExyY* WhitePoint)
{
return cmsCreateLab2ProfileTHR(NULL, WhitePoint);
}
// Use darker colorants to obtain black point. This works in the relative colorimetric intent and
// assumes more ink results in darker colors. No ink limit is assumed.
static
cmsBool BlackPointAsDarkerColorant(cmsHPROFILE hInput,
cmsUInt32Number Intent,
cmsCIEXYZ* BlackPoint,
cmsUInt32Number dwFlags)
{
cmsUInt16Number *Black;
cmsHTRANSFORM xform;
cmsColorSpaceSignature Space;
cmsUInt32Number nChannels;
cmsUInt32Number dwFormat;
cmsHPROFILE hLab;
cmsCIELab Lab;
cmsCIEXYZ BlackXYZ;
cmsContext ContextID = cmsGetProfileContextID(hInput);
// If the profile does not support input direction, assume Black point 0
if (!cmsIsIntentSupported(hInput, Intent, LCMS_USED_AS_INPUT)) {
BlackPoint -> X = BlackPoint ->Y = BlackPoint -> Z = 0.0;
return FALSE;
}
// Create a formatter which has n channels and floating point
dwFormat = cmsFormatterForColorspaceOfProfile(hInput, 2);
// Try to get black by using black colorant
Space = cmsGetColorSpace(hInput);
// This function returns darker colorant in 16 bits for several spaces
if (!_cmsEndPointsBySpace(Space, NULL, &Black, &nChannels)) {
BlackPoint -> X = BlackPoint ->Y = BlackPoint -> Z = 0.0;
return FALSE;
}
if (nChannels != T_CHANNELS(dwFormat)) {
BlackPoint -> X = BlackPoint ->Y = BlackPoint -> Z = 0.0;
return FALSE;
}
// Lab will be used as the output space, but lab2 will avoid recursion
hLab = cmsCreateLab2ProfileTHR(ContextID, NULL);
if (hLab == NULL) {
BlackPoint -> X = BlackPoint ->Y = BlackPoint -> Z = 0.0;
return FALSE;
}
// Create the transform
xform = cmsCreateTransformTHR(ContextID, hInput, dwFormat,
hLab, TYPE_Lab_DBL, Intent, cmsFLAGS_NOOPTIMIZE|cmsFLAGS_NOCACHE);
cmsCloseProfile(hLab);
if (xform == NULL) {
// Something went wrong. Get rid of open resources and return zero as black
BlackPoint -> X = BlackPoint ->Y = BlackPoint -> Z = 0.0;
return FALSE;
}
// Convert black to Lab
cmsDoTransform(xform, Black, &Lab, 1);
// Force it to be neutral, clip to max. L* of 50
Lab.a = Lab.b = 0;
if (Lab.L > 50) Lab.L = 50;
// Free the resources
cmsDeleteTransform(xform);
// Convert from Lab (which is now clipped) to XYZ.
cmsLab2XYZ(NULL, &BlackXYZ, &Lab);
if (BlackPoint != NULL)
*BlackPoint = BlackXYZ;
return TRUE;
cmsUNUSED_PARAMETER(dwFlags);
}