int cmsDetectBlackPoint(LPcmsCIEXYZ BlackPoint, cmsHPROFILE hProfile, int Intent, DWORD dwFlags) { // v4 + perceptual & saturation intents does have its own black point if ((cmsGetProfileICCversion(hProfile) >= 0x4000000) && (Intent == INTENT_PERCEPTUAL || Intent == INTENT_SATURATION)) { return GetV4PerceptualBlack(BlackPoint, hProfile, dwFlags); } #ifdef HONOR_BLACK_POINT_TAG // v2, v4 rel/abs colorimetric if (cmsIsTag(hProfile, icSigMediaBlackPointTag) && Intent == INTENT_RELATIVE_COLORIMETRIC) { cmsCIEXYZ BlackXYZ, UntrustedBlackPoint, TrustedBlackPoint, MediaWhite; cmsCIELab Lab; // If black point is specified, then use it, cmsTakeMediaBlackPoint(&BlackXYZ, hProfile); cmsTakeMediaWhitePoint(&MediaWhite, hProfile); // Black point is absolute XYZ, so adapt to D50 to get PCS value cmsAdaptToIlluminant(&UntrustedBlackPoint, &MediaWhite, cmsD50_XYZ(), &BlackXYZ); // Force a=b=0 to get rid of any chroma cmsXYZ2Lab(NULL, &Lab, &UntrustedBlackPoint); Lab.a = Lab.b = 0; if (Lab.L > 50) Lab.L = 50; // Clip to L* <= 50 cmsLab2XYZ(NULL, &TrustedBlackPoint, &Lab); // Return BP as D50 relative or absolute XYZ (depends on flags) if (!(dwFlags & LCMS_BPFLAGS_D50_ADAPTED)) cmsAdaptToIlluminant(BlackPoint, cmsD50_XYZ(), &MediaWhite, &TrustedBlackPoint); else *BlackPoint = TrustedBlackPoint; } #endif // If output profile, discount ink-limiting if (Intent == INTENT_RELATIVE_COLORIMETRIC && (cmsGetDeviceClass(hProfile) == icSigOutputClass) && (cmsGetColorSpace(hProfile) == icSigCmykData)) return BlackPointUsingPerceptualBlack(BlackPoint, hProfile, dwFlags); // Nope, compute BP using current intent. return BlackPointAsDarkerColorant(hProfile, Intent, BlackPoint, dwFlags); }
// Get a media white point fixing some issues found in certain old profiles cmsBool _cmsReadMediaWhitePoint(cmsCIEXYZ* Dest, cmsHPROFILE hProfile) { cmsCIEXYZ* Tag; _cmsAssert(Dest != NULL); Tag = (cmsCIEXYZ*) cmsReadTag(hProfile, cmsSigMediaWhitePointTag); // If no wp, take D50 if (Tag == NULL) { *Dest = *cmsD50_XYZ(); return TRUE; } // V2 display profiles should give D50 if (cmsGetEncodedICCversion(hProfile) < 0x4000000) { if (cmsGetDeviceClass(hProfile) == cmsSigDisplayClass) { *Dest = *cmsD50_XYZ(); return TRUE; } } // All seems ok *Dest = *Tag; return TRUE; }
// Approximate a blackbody illuminant based on CHAD information static cmsFloat64Number CHAD2Temp(const cmsMAT3* Chad) { // Convert D50 across inverse CHAD to get the absolute white point cmsVEC3 d, s; cmsCIEXYZ Dest; cmsCIExyY DestChromaticity; cmsFloat64Number TempK; cmsMAT3 m1, m2; m1 = *Chad; if (!_cmsMAT3inverse(&m1, &m2)) return FALSE; s.n[VX] = cmsD50_XYZ() -> X; s.n[VY] = cmsD50_XYZ() -> Y; s.n[VZ] = cmsD50_XYZ() -> Z; _cmsMAT3eval(&d, &m2, &s); Dest.X = d.n[VX]; Dest.Y = d.n[VY]; Dest.Z = d.n[VZ]; cmsXYZ2xyY(&DestChromaticity, &Dest); if (!cmsTempFromWhitePoint(&TempK, &DestChromaticity)) return -1.0; return TempK; }
// Black point compensation. Implemented as a linear scaling in XYZ. Black points // should come relative to the white point. Fills an matrix/offset element m // which is organized as a 4x4 matrix. static void ComputeBlackPointCompensation(const cmsCIEXYZ* BlackPointIn, const cmsCIEXYZ* BlackPointOut, cmsMAT3* m, cmsVEC3* off) { cmsFloat64Number ax, ay, az, bx, by, bz, tx, ty, tz; // Now we need to compute a matrix plus an offset m and of such of // [m]*bpin + off = bpout // [m]*D50 + off = D50 // // This is a linear scaling in the form ax+b, where // a = (bpout - D50) / (bpin - D50) // b = - D50* (bpout - bpin) / (bpin - D50) tx = BlackPointIn->X - cmsD50_XYZ()->X; ty = BlackPointIn->Y - cmsD50_XYZ()->Y; tz = BlackPointIn->Z - cmsD50_XYZ()->Z; ax = (BlackPointOut->X - cmsD50_XYZ()->X) / tx; ay = (BlackPointOut->Y - cmsD50_XYZ()->Y) / ty; az = (BlackPointOut->Z - cmsD50_XYZ()->Z) / tz; bx = - cmsD50_XYZ()-> X * (BlackPointOut->X - BlackPointIn->X) / tx; by = - cmsD50_XYZ()-> Y * (BlackPointOut->Y - BlackPointIn->Y) / ty; bz = - cmsD50_XYZ()-> Z * (BlackPointOut->Z - BlackPointIn->Z) / tz; _cmsVEC3init(&m ->v[0], ax, 0, 0); _cmsVEC3init(&m ->v[1], 0, ay, 0); _cmsVEC3init(&m ->v[2], 0, 0, az); _cmsVEC3init(off, bx, by, bz); }
static void EmitWhiteBlackD50(cmsIOHANDLER* m, cmsCIEXYZ* BlackPoint) { _cmsIOPrintf(m, "/BlackPoint [%f %f %f]\n", BlackPoint -> X, BlackPoint -> Y, BlackPoint -> Z); _cmsIOPrintf(m, "/WhitePoint [%f %f %f]\n", cmsD50_XYZ()->X, cmsD50_XYZ()->Y, cmsD50_XYZ()->Z); }
// Chromatic adaptation matrix. Fix some issues as well cmsBool _cmsReadCHAD(cmsMAT3* Dest, cmsHPROFILE hProfile) { cmsMAT3* Tag; _cmsAssert(Dest != NULL); Tag = (cmsMAT3*) cmsReadTag(hProfile, cmsSigChromaticAdaptationTag); if (Tag != NULL) { *Dest = *Tag; return TRUE; } // No CHAD available, default it to identity _cmsMAT3identity(Dest); // V2 display profiles should give D50 if (cmsGetEncodedICCversion(hProfile) < 0x4000000) { if (cmsGetDeviceClass(hProfile) == cmsSigDisplayClass) { cmsCIEXYZ* White = (cmsCIEXYZ*) cmsReadTag(hProfile, cmsSigMediaWhitePointTag); if (White == NULL) { _cmsMAT3identity(Dest); return TRUE; } return _cmsAdaptationMatrix(Dest, NULL, White, cmsD50_XYZ()); } } return TRUE; }
LCMSAPI LPcmsCIExyY LCMSEXPORT cmsD50_xyY(void) { static cmsCIExyY D50xyY; cmsXYZ2xyY(&D50xyY, cmsD50_XYZ()); return &D50xyY; }
const cmsCIExyY* CMSEXPORT cmsD50_xyY(void) { static cmsCIExyY D50xyY; cmsXYZ2xyY(&D50xyY, cmsD50_XYZ()); return &D50xyY; }
// Compute a CHAD based on a given temperature static void Temp2CHAD(cmsMAT3* Chad, cmsFloat64Number Temp) { cmsCIEXYZ White; cmsCIExyY ChromaticityOfWhite; cmsWhitePointFromTemp(&ChromaticityOfWhite, Temp); cmsxyY2XYZ(&White, &ChromaticityOfWhite); _cmsAdaptationMatrix(Chad, NULL, &White, cmsD50_XYZ()); }
static int BlackPointUsingPerceptualBlack(LPcmsCIEXYZ BlackPoint, cmsHPROFILE hProfile, DWORD dwFlags) { cmsHTRANSFORM hPercLab2CMYK, hRelColCMYK2Lab; cmsHPROFILE hLab; cmsCIELab LabIn, LabOut; WORD CMYK[MAXCHANNELS]; cmsCIEXYZ BlackXYZ, MediaWhite; if (!cmsIsIntentSupported(hProfile, INTENT_PERCEPTUAL, LCMS_USED_AS_INPUT)) { BlackPoint -> X = BlackPoint ->Y = BlackPoint -> Z = 0.0; return 0; } hLab = cmsCreateLabProfile(NULL); hPercLab2CMYK = cmsCreateTransform(hLab, TYPE_Lab_DBL, hProfile, TYPE_CMYK_16, INTENT_PERCEPTUAL, cmsFLAGS_NOTPRECALC); hRelColCMYK2Lab = cmsCreateTransform(hProfile, TYPE_CMYK_16, hLab, TYPE_Lab_DBL, INTENT_RELATIVE_COLORIMETRIC, cmsFLAGS_NOTPRECALC); LabIn.L = LabIn.a = LabIn.b = 0; cmsDoTransform(hPercLab2CMYK, &LabIn, CMYK, 1); cmsDoTransform(hRelColCMYK2Lab, CMYK, &LabOut, 1); if (LabOut.L > 50) LabOut.L = 50; LabOut.a = LabOut.b = 0; cmsDeleteTransform(hPercLab2CMYK); cmsDeleteTransform(hRelColCMYK2Lab); cmsCloseProfile(hLab); cmsLab2XYZ(NULL, &BlackXYZ, &LabOut); if (!(dwFlags & LCMS_BPFLAGS_D50_ADAPTED)){ cmsTakeMediaWhitePoint(&MediaWhite, hProfile); cmsAdaptToIlluminant(BlackPoint, cmsD50_XYZ(), &MediaWhite, &BlackXYZ); } else *BlackPoint = BlackXYZ; return 1; }
// Creates a fake NULL profile. This profile return 1 channel as always 0. // Is useful only for gamut checking tricks cmsHPROFILE CMSEXPORT cmsCreateNULLProfileTHR(cmsContext ContextID) { cmsHPROFILE hProfile; cmsPipeline* LUT = NULL; cmsStage* PostLin; cmsToneCurve* EmptyTab; cmsUInt16Number Zero[2] = { 0, 0 }; hProfile = cmsCreateProfilePlaceholder(ContextID); if (!hProfile) // can't allocate return NULL; cmsSetProfileVersion(hProfile, 4.3); if (!SetTextTags(hProfile, L"NULL profile built-in")) goto Error; cmsSetDeviceClass(hProfile, cmsSigOutputClass); cmsSetColorSpace(hProfile, cmsSigGrayData); cmsSetPCS(hProfile, cmsSigLabData); // An empty LUTs is all we need LUT = cmsPipelineAlloc(ContextID, 1, 1); if (LUT == NULL) goto Error; EmptyTab = cmsBuildTabulatedToneCurve16(ContextID, 2, Zero); PostLin = cmsStageAllocToneCurves(ContextID, 1, &EmptyTab); cmsFreeToneCurve(EmptyTab); if (!cmsPipelineInsertStage(LUT, cmsAT_END, PostLin)) goto Error; if (!cmsWriteTag(hProfile, cmsSigBToA0Tag, (void*) LUT)) goto Error; if (!cmsWriteTag(hProfile, cmsSigMediaWhitePointTag, cmsD50_XYZ())) goto Error; cmsPipelineFree(LUT); return hProfile; Error: if (LUT != NULL) cmsPipelineFree(LUT); if (hProfile != NULL) cmsCloseProfile(hProfile); return NULL; }
BOOL cmsAdaptMatrixFromD50(LPMAT3 r, LPcmsCIExyY DestWhitePt) { cmsCIEXYZ Dn; MAT3 Bradford; MAT3 Tmp; cmsxyY2XYZ(&Dn, DestWhitePt); cmsAdaptationMatrix(&Bradford, NULL, cmsD50_XYZ(), &Dn); Tmp = *r; MAT3per(r, &Bradford, &Tmp); return TRUE; }
BOOL cmsAdaptMatrixToD50(LPMAT3 r, LPcmsCIExyY SourceWhitePt) { cmsCIEXYZ Dn; MAT3 Bradford; MAT3 Tmp; cmsxyY2XYZ(&Dn, SourceWhitePt); cmsAdaptationMatrix(&Bradford, NULL, &Dn, cmsD50_XYZ()); Tmp = *r; MAT3per(r, &Bradford, &Tmp); return TRUE; }
/// WAS: Same as anterior, but assuming D50 source. White point is given in xyY static cmsBool cmsAdaptMatrixFromD50(cmsMAT3* const r, const cmsCIExyY* const DestWhitePt) { cmsCIEXYZ Dn; cmsMAT3 Bradford; cmsMAT3 Tmp; cmsxyY2XYZ(&Dn, DestWhitePt); if (!_cmsAdaptationMatrix(&Bradford, NULL, &Dn, cmsD50_XYZ())) return FALSE; Tmp = *r; _cmsMAT3per(r, &Bradford, &Tmp); return TRUE; }
cmsHPROFILE _cmsCreateProfilePlaceholder(void) { LPLCMSICCPROFILE Icc = (LPLCMSICCPROFILE) _cmsMalloc(sizeof(LCMSICCPROFILE)); if (Icc == NULL) return NULL; // Empty values ZeroMemory(Icc, sizeof(LCMSICCPROFILE)); // Make sure illuminant is correct Icc ->Illuminant = *cmsD50_XYZ(); // Set it to empty Icc -> TagCount = 0; // Return the handle return (cmsHPROFILE) Icc; }
cmsHPROFILE LCMSEXPORT cmsCreateLinearizationDeviceLink(icColorSpaceSignature ColorSpace, LPGAMMATABLE TransferFunctions[]) { cmsHPROFILE hICC; LPLUT Lut; hICC = _cmsCreateProfilePlaceholder(); if (!hICC) // can't allocate return NULL; cmsSetDeviceClass(hICC, icSigLinkClass); cmsSetColorSpace(hICC, ColorSpace); cmsSetPCS(hICC, ColorSpace); cmsSetRenderingIntent(hICC, INTENT_PERCEPTUAL); // Creates a LUT with prelinearization step only Lut = cmsAllocLUT(); if (Lut == NULL) return NULL; // Set up channels Lut ->InputChan = Lut ->OutputChan = _cmsChannelsOf(ColorSpace); // Copy tables to LUT cmsAllocLinearTable(Lut, TransferFunctions, 1); // Create tags cmsAddTag(hICC, icSigDeviceMfgDescTag, (LPVOID) "(lcms internal)"); cmsAddTag(hICC, icSigProfileDescriptionTag, (LPVOID) "lcms linearization device link"); cmsAddTag(hICC, icSigDeviceModelDescTag, (LPVOID) "linearization built-in"); cmsAddTag(hICC, icSigMediaWhitePointTag, (LPVOID) cmsD50_XYZ()); cmsAddTag(hICC, icSigAToB0Tag, (LPVOID) Lut); // LUT is already on virtual profile cmsFreeLUT(Lut); // Ok, done return hICC; }
static LCMSBOOL updateHeader(LPLCMSICCPROFILE Icc) { icHeader head; readMemBuffer(&head, sizeof(icHeader), 1, Icc -> stream); // Stop processing if data are corrupted if (swapBytes32(head.magic) != icMagicNumber) return FALSE; Icc->Version = swapBytes32(head.version); Icc->DeviceClass = swapBytes32(head.deviceClass); Icc->ColorSpace = swapBytes32(head.colorSpace); Icc->PCS = swapBytes32(head.pcs); Icc->flags = swapBytes32(head.flags); Icc->RenderingIntent = (icRenderingIntent) swapBytes32(head.renderingIntent); // For now ICC spec states that illuminant should be D50 in all profiles Icc->Illuminant = *cmsD50_XYZ(); return TRUE; }
void updateCriticalTags(LPLCMSICCPROFILE Icc) { LPVOID savedData = NULL; int idx; cmsCIEXYZ* dummy; MemBuffer *memBuffer = (MemBuffer*) Icc->stream; if(!memBuffer->needsUpdateCriticalTags) // Nothing to do return; idx = findTag(Icc, icSigMediaWhitePointTag); dummy = cmsD50_XYZ(); if(idx >= 0) { // There is media white point already cmsAddTag(Icc, icSigMediaWhitePointTag, dummy); // Force LCMS to read critical tags free(Icc->TagPtrs[idx]); // Get rid of dummy media white point Icc->TagPtrs[idx] = NULL; } else { cmsAddTag(Icc, icSigMediaWhitePointTag, dummy); // Force LCMS to read critical tags // Get rid of dummy media white point free(Icc->TagPtrs[Icc->TagCount-1]); Icc->TagPtrs[Icc->TagCount-1] = NULL; Icc->TagNames[Icc->TagCount-1] = 0; Icc->TagSizes[Icc->TagCount-1] = 0; Icc->TagOffsets[Icc->TagCount-1] = 0; Icc->TagCount--; } memBuffer->needsUpdateCriticalTags = FALSE; }
// Get Perceptual black of v4 profiles. static int GetV4PerceptualBlack(LPcmsCIEXYZ BlackPoint, cmsHPROFILE hProfile, DWORD dwFlags) { if (dwFlags & LCMS_BPFLAGS_D50_ADAPTED) { BlackPoint->X = PERCEPTUAL_BLACK_X; BlackPoint->Y = PERCEPTUAL_BLACK_Y; BlackPoint->Z = PERCEPTUAL_BLACK_Z; } else { cmsCIEXYZ D50BlackPoint, MediaWhite; cmsTakeMediaWhitePoint(&MediaWhite, hProfile); D50BlackPoint.X = PERCEPTUAL_BLACK_X; D50BlackPoint.Y = PERCEPTUAL_BLACK_Y; D50BlackPoint.Z = PERCEPTUAL_BLACK_Z; cmsAdaptToIlluminant(BlackPoint, cmsD50_XYZ(), &MediaWhite, &D50BlackPoint); } return 1; }
void LCMSEXPORT cmsLab2XYZ(LPcmsCIEXYZ WhitePoint, LPcmsCIEXYZ xyz, const cmsCIELab* Lab) { double x, y, z; if (Lab -> L <= 0) { xyz -> X = 0; xyz -> Y = 0; xyz -> Z = 0; return; } if (WhitePoint == NULL) WhitePoint = cmsD50_XYZ(); y = (Lab-> L + 16.0) / 116.0; x = y + 0.002 * Lab -> a; z = y - 0.005 * Lab -> b; xyz -> X = f_1(x) * WhitePoint -> X; xyz -> Y = f_1(y) * WhitePoint -> Y; xyz -> Z = f_1(z) * WhitePoint -> Z; }
void LCMSEXPORT cmsXYZ2Lab(LPcmsCIEXYZ WhitePoint, LPcmsCIELab Lab, const cmsCIEXYZ* xyz) { double fx, fy, fz; if (xyz -> X == 0 && xyz -> Y == 0 && xyz -> Z == 0) { Lab -> L = 0; Lab -> a = 0; Lab -> b = 0; return; } if (WhitePoint == NULL) WhitePoint = cmsD50_XYZ(); fx = f(xyz->X / WhitePoint->X); fy = f(xyz->Y / WhitePoint->Y); fz = f(xyz->Z / WhitePoint->Z); Lab->L = 116.0* fy - 16.; Lab->a = 500.0*(fx - fy); Lab->b = 200.0*(fy - fz); }
cmsHPROFILE LCMSEXPORT cmsTransform2DeviceLink(cmsHTRANSFORM hTransform, DWORD dwFlags) { cmsHPROFILE hICC; _LPcmsTRANSFORM v = (_LPcmsTRANSFORM) hTransform; LPLUT Lut; LCMSBOOL MustFreeLUT; LPcmsNAMEDCOLORLIST InputColorant = NULL; LPcmsNAMEDCOLORLIST OutputColorant = NULL; // Check if is a named color transform if (cmsGetDeviceClass(v ->InputProfile) == icSigNamedColorClass) { return CreateNamedColorDevicelink(hTransform); } if (v ->DeviceLink) { Lut = v -> DeviceLink; MustFreeLUT = FALSE; } else { Lut = _cmsPrecalculateDeviceLink(hTransform, dwFlags); if (!Lut) return NULL; MustFreeLUT = TRUE; } hICC = _cmsCreateProfilePlaceholder(); if (!hICC) { // can't allocate if (MustFreeLUT) cmsFreeLUT(Lut); return NULL; } FixColorSpaces(hICC, v -> EntryColorSpace, v -> ExitColorSpace, dwFlags); cmsSetRenderingIntent(hICC, v -> Intent); // Implement devicelink profile using following tags: // // 1 icSigProfileDescriptionTag // 2 icSigMediaWhitePointTag // 3 icSigAToB0Tag cmsAddTag(hICC, icSigDeviceMfgDescTag, (LPVOID) "LittleCMS"); cmsAddTag(hICC, icSigProfileDescriptionTag, (LPVOID) "Device link"); cmsAddTag(hICC, icSigDeviceModelDescTag, (LPVOID) "Device link"); cmsAddTag(hICC, icSigMediaWhitePointTag, (LPVOID) cmsD50_XYZ()); if (cmsGetDeviceClass(hICC) == icSigOutputClass) { cmsAddTag(hICC, icSigBToA0Tag, (LPVOID) Lut); } else cmsAddTag(hICC, icSigAToB0Tag, (LPVOID) Lut); // Try to read input and output colorant table if (cmsIsTag(v ->InputProfile, icSigColorantTableTag)) { // Input table can only come in this way. InputColorant = cmsReadColorantTable(v ->InputProfile, icSigColorantTableTag); } // Output is a little bit more complex. if (cmsGetDeviceClass(v ->OutputProfile) == icSigLinkClass) { // This tag may exist only on devicelink profiles. if (cmsIsTag(v ->OutputProfile, icSigColorantTableOutTag)) { OutputColorant = cmsReadColorantTable(v ->OutputProfile, icSigColorantTableOutTag); } } else { if (cmsIsTag(v ->OutputProfile, icSigColorantTableTag)) { OutputColorant = cmsReadColorantTable(v ->OutputProfile, icSigColorantTableTag); } } if (InputColorant) cmsAddTag(hICC, icSigColorantTableTag, InputColorant); if (OutputColorant) cmsAddTag(hICC, icSigColorantTableOutTag, OutputColorant); if (MustFreeLUT) cmsFreeLUT(Lut); if (InputColorant) cmsFreeNamedColorList(InputColorant); if (OutputColorant) cmsFreeNamedColorList(OutputColorant); return hICC; }
cmsHPROFILE LCMSEXPORT cmsCreateInkLimitingDeviceLink(icColorSpaceSignature ColorSpace, double Limit) { cmsHPROFILE hICC; LPLUT Lut; if (ColorSpace != icSigCmykData) { cmsSignalError(LCMS_ERRC_ABORTED, "InkLimiting: Only CMYK currently supported"); return NULL; } if (Limit < 0.0 || Limit > 400) { cmsSignalError(LCMS_ERRC_WARNING, "InkLimiting: Limit should be between 0..400"); if (Limit < 0) Limit = 0; if (Limit > 400) Limit = 400; } hICC = _cmsCreateProfilePlaceholder(); if (!hICC) // can't allocate return NULL; cmsSetDeviceClass(hICC, icSigLinkClass); cmsSetColorSpace(hICC, ColorSpace); cmsSetPCS(hICC, ColorSpace); cmsSetRenderingIntent(hICC, INTENT_PERCEPTUAL); // Creates a LUT with 3D grid only Lut = cmsAllocLUT(); if (Lut == NULL) { cmsCloseProfile(hICC); return NULL; } cmsAlloc3DGrid(Lut, 17, _cmsChannelsOf(ColorSpace), _cmsChannelsOf(ColorSpace)); if (!cmsSample3DGrid(Lut, InkLimitingSampler, (LPVOID) &Limit, 0)) { // Shouldn't reach here cmsFreeLUT(Lut); cmsCloseProfile(hICC); return NULL; } // Create tags cmsAddTag(hICC, icSigDeviceMfgDescTag, (LPVOID) "(lcms internal)"); cmsAddTag(hICC, icSigProfileDescriptionTag, (LPVOID) "lcms ink limiting device link"); cmsAddTag(hICC, icSigDeviceModelDescTag, (LPVOID) "ink limiting built-in"); cmsAddTag(hICC, icSigMediaWhitePointTag, (LPVOID) cmsD50_XYZ()); cmsAddTag(hICC, icSigAToB0Tag, (LPVOID) Lut); // LUT is already on virtual profile cmsFreeLUT(Lut); // Ok, done return hICC; }
static int FromLabRelLUT(int Absolute, LPcmsCIEXYZ BlackPointIn, LPcmsCIEXYZ WhitePointIn, LPcmsCIEXYZ IlluminantIn, LPMAT3 ChromaticAdaptationMatrixIn, int Phase2, LPcmsCIEXYZ BlackPointOut, LPcmsCIEXYZ WhitePointOut, LPcmsCIEXYZ IlluminantOut, LPMAT3 ChromaticAdaptationMatrixOut, int DoBlackPointCompensation, double AdaptationState, _cmsADJFN *fn1, LPMAT3 m, LPVEC3 of) { switch (Phase2) { // From Lab Relative to XYZ Relative, very usual case case XYZRel: if (Absolute) { // Absolute intent // From lab relative, to XYZ absolute, and then, // back to XYZ relative Rel2RelStepAbsCoefs(AdaptationState, BlackPointIn, WhitePointIn, cmsD50_XYZ(), ChromaticAdaptationMatrixIn, BlackPointOut, WhitePointOut, IlluminantOut, ChromaticAdaptationMatrixOut, m, of); *fn1 = Lab2XYZ; } else { // From Lab relative, to XYZ relative. *fn1 = Lab2XYZ; if (DoBlackPointCompensation) { ComputeBlackPointCompensationFactors(BlackPointIn, WhitePointIn, IlluminantIn, BlackPointOut, WhitePointOut, IlluminantOut, m, of); } } break; case LabRel: if (Absolute) { // First pass to XYZ using the input illuminant // * InIlluminant / D50, then to absolute. Then // to relative, but for input Rel2RelStepAbsCoefs(AdaptationState, BlackPointIn, WhitePointIn, IlluminantIn, ChromaticAdaptationMatrixIn, BlackPointOut, WhitePointOut, cmsD50_XYZ(), ChromaticAdaptationMatrixOut, m, of); *fn1 = Lab2XYZ2Lab; } else { // Lab -> Lab relative don't need any adjust unless // black point compensation *fn1 = NULL; if (DoBlackPointCompensation) { *fn1 = Lab2XYZ2Lab; ComputeBlackPointCompensationFactors(BlackPointIn, WhitePointIn, IlluminantIn, BlackPointOut, WhitePointOut, IlluminantOut, m, of); } } break; default: return FALSE; } return TRUE; }
cmsBool CMSEXPORT cmsDetectBlackPoint(cmsCIEXYZ* BlackPoint, cmsHPROFILE hProfile, cmsUInt32Number Intent, cmsUInt32Number dwFlags) { // Zero for black point if (cmsGetDeviceClass(hProfile) == cmsSigLinkClass) { BlackPoint -> X = BlackPoint ->Y = BlackPoint -> Z = 0.0; return FALSE; } // v4 + perceptual & saturation intents does have its own black point, and it is // well specified enough to use it. Black point tag is deprecated in V4. if ((cmsGetEncodedICCversion(hProfile) >= 0x4000000) && (Intent == INTENT_PERCEPTUAL || Intent == INTENT_SATURATION)) { // Matrix shaper share MRC & perceptual intents if (cmsIsMatrixShaper(hProfile)) return BlackPointAsDarkerColorant(hProfile, INTENT_RELATIVE_COLORIMETRIC, BlackPoint, 0); // Get Perceptual black out of v4 profiles. That is fixed for perceptual & saturation intents BlackPoint -> X = cmsPERCEPTUAL_BLACK_X; BlackPoint -> Y = cmsPERCEPTUAL_BLACK_Y; BlackPoint -> Z = cmsPERCEPTUAL_BLACK_Z; return TRUE; } #ifdef CMS_USE_PROFILE_BLACK_POINT_TAG // v2, v4 rel/abs colorimetric if (cmsIsTag(hProfile, cmsSigMediaBlackPointTag) && Intent == INTENT_RELATIVE_COLORIMETRIC) { cmsCIEXYZ *BlackPtr, BlackXYZ, UntrustedBlackPoint, TrustedBlackPoint, MediaWhite; cmsCIELab Lab; // If black point is specified, then use it, BlackPtr = cmsReadTag(hProfile, cmsSigMediaBlackPointTag); if (BlackPtr != NULL) { BlackXYZ = *BlackPtr; _cmsReadMediaWhitePoint(&MediaWhite, hProfile); // Black point is absolute XYZ, so adapt to D50 to get PCS value cmsAdaptToIlluminant(&UntrustedBlackPoint, &MediaWhite, cmsD50_XYZ(), &BlackXYZ); // Force a=b=0 to get rid of any chroma cmsXYZ2Lab(NULL, &Lab, &UntrustedBlackPoint); Lab.a = Lab.b = 0; if (Lab.L > 50) Lab.L = 50; // Clip to L* <= 50 cmsLab2XYZ(NULL, &TrustedBlackPoint, &Lab); if (BlackPoint != NULL) *BlackPoint = TrustedBlackPoint; return TRUE; } } #endif // That is about v2 profiles. // If output profile, discount ink-limiting and that's all if (Intent == INTENT_RELATIVE_COLORIMETRIC && (cmsGetDeviceClass(hProfile) == cmsSigOutputClass) && (cmsGetColorSpace(hProfile) == cmsSigCmykData)) return BlackPointUsingPerceptualBlack(BlackPoint, hProfile); // Nope, compute BP using current intent. return BlackPointAsDarkerColorant(hProfile, Intent, BlackPoint, dwFlags); }
static int BlackPointAsDarkerColorant(cmsHPROFILE hInput, int Intent, LPcmsCIEXYZ BlackPoint, DWORD dwFlags) { WORD *Black, *White; cmsHTRANSFORM xform; icColorSpaceSignature Space; int nChannels; DWORD dwFormat; cmsHPROFILE hLab; cmsCIELab Lab; cmsCIEXYZ BlackXYZ, MediaWhite; // 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 0; } // Try to get black by using black colorant Space = cmsGetColorSpace(hInput); if (!_cmsEndPointsBySpace(Space, &White, &Black, &nChannels)) { BlackPoint -> X = BlackPoint ->Y = BlackPoint -> Z = 0.0; return 0; } dwFormat = CHANNELS_SH(nChannels)|BYTES_SH(2); hLab = cmsCreateLabProfile(NULL); xform = cmsCreateTransform(hInput, dwFormat, hLab, TYPE_Lab_DBL, Intent, cmsFLAGS_NOTPRECALC); 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; cmsCloseProfile(hLab); cmsDeleteTransform(xform); cmsLab2XYZ(NULL, &BlackXYZ, &Lab); if (Intent == INTENT_ABSOLUTE_COLORIMETRIC) { *BlackPoint = BlackXYZ; } else { if (!(dwFlags & LCMS_BPFLAGS_D50_ADAPTED)) { cmsTakeMediaWhitePoint(&MediaWhite, hInput); cmsAdaptToIlluminant(BlackPoint, cmsD50_XYZ(), &MediaWhite, &BlackXYZ); } else *BlackPoint = BlackXYZ; } return 1; }
cmsHPROFILE CMSEXPORT cmsCreateBCHSWabstractProfileTHR(cmsContext ContextID, int nLUTPoints, cmsFloat64Number Bright, cmsFloat64Number Contrast, cmsFloat64Number Hue, cmsFloat64Number Saturation, int TempSrc, int TempDest) { cmsHPROFILE hICC; cmsPipeline* Pipeline; BCHSWADJUSTS bchsw; cmsCIExyY WhitePnt; cmsStage* CLUT; cmsUInt32Number Dimensions[MAX_INPUT_DIMENSIONS]; int i; bchsw.Brightness = Bright; bchsw.Contrast = Contrast; bchsw.Hue = Hue; bchsw.Saturation = Saturation; cmsWhitePointFromTemp(&WhitePnt, TempSrc ); cmsxyY2XYZ(&bchsw.WPsrc, &WhitePnt); cmsWhitePointFromTemp(&WhitePnt, TempDest); cmsxyY2XYZ(&bchsw.WPdest, &WhitePnt); hICC = cmsCreateProfilePlaceholder(ContextID); if (!hICC) // can't allocate return NULL; cmsSetDeviceClass(hICC, cmsSigAbstractClass); cmsSetColorSpace(hICC, cmsSigLabData); cmsSetPCS(hICC, cmsSigLabData); cmsSetHeaderRenderingIntent(hICC, INTENT_PERCEPTUAL); // Creates a Pipeline with 3D grid only Pipeline = cmsPipelineAlloc(ContextID, 3, 3); if (Pipeline == NULL) { cmsCloseProfile(hICC); return NULL; } for (i=0; i < MAX_INPUT_DIMENSIONS; i++) Dimensions[i] = nLUTPoints; CLUT = cmsStageAllocCLut16bitGranular(ContextID, Dimensions, 3, 3, NULL); if (CLUT == NULL) return NULL; if (!cmsStageSampleCLut16bit(CLUT, bchswSampler, (void*) &bchsw, 0)) { // Shouldn't reach here goto Error; } if (!cmsPipelineInsertStage(Pipeline, cmsAT_END, CLUT)) { goto Error; } // Create tags if (!SetTextTags(hICC, L"BCHS built-in")) return NULL; cmsWriteTag(hICC, cmsSigMediaWhitePointTag, (void*) cmsD50_XYZ()); cmsWriteTag(hICC, cmsSigAToB0Tag, (void*) Pipeline); // Pipeline is already on virtual profile cmsPipelineFree(Pipeline); // Ok, done return hICC; Error: cmsPipelineFree(Pipeline); cmsCloseProfile(hICC); return NULL; }
// This function creates a profile based on White point, primaries and // transfer functions. cmsHPROFILE CMSEXPORT cmsCreateRGBProfileTHR(cmsContext ContextID, const cmsCIExyY* WhitePoint, const cmsCIExyYTRIPLE* Primaries, cmsToneCurve* const TransferFunction[3]) { cmsHPROFILE hICC; cmsMAT3 MColorants; cmsCIEXYZTRIPLE Colorants; cmsCIExyY MaxWhite; cmsMAT3 CHAD; cmsCIEXYZ WhitePointXYZ; hICC = cmsCreateProfilePlaceholder(ContextID); if (!hICC) // can't allocate return NULL; cmsSetProfileVersion(hICC, 4.3); cmsSetDeviceClass(hICC, cmsSigDisplayClass); cmsSetColorSpace(hICC, cmsSigRgbData); cmsSetPCS(hICC, cmsSigXYZData); cmsSetHeaderRenderingIntent(hICC, INTENT_PERCEPTUAL); // Implement profile using following tags: // // 1 cmsSigProfileDescriptionTag // 2 cmsSigMediaWhitePointTag // 3 cmsSigRedColorantTag // 4 cmsSigGreenColorantTag // 5 cmsSigBlueColorantTag // 6 cmsSigRedTRCTag // 7 cmsSigGreenTRCTag // 8 cmsSigBlueTRCTag // 9 Chromatic adaptation Tag // This conforms a standard RGB DisplayProfile as says ICC, and then I add (As per addendum II) // 10 cmsSigChromaticityTag if (!SetTextTags(hICC, L"RGB built-in")) goto Error; if (WhitePoint) { if (!cmsWriteTag(hICC, cmsSigMediaWhitePointTag, cmsD50_XYZ())) goto Error; cmsxyY2XYZ(&WhitePointXYZ, WhitePoint); _cmsAdaptationMatrix(&CHAD, NULL, &WhitePointXYZ, cmsD50_XYZ()); // This is a V4 tag, but many CMM does read and understand it no matter which version if (!cmsWriteTag(hICC, cmsSigChromaticAdaptationTag, (void*) &CHAD)) goto Error; } if (WhitePoint && Primaries) { MaxWhite.x = WhitePoint -> x; MaxWhite.y = WhitePoint -> y; MaxWhite.Y = 1.0; if (!_cmsBuildRGB2XYZtransferMatrix(&MColorants, &MaxWhite, Primaries)) goto Error; Colorants.Red.X = MColorants.v[0].n[0]; Colorants.Red.Y = MColorants.v[1].n[0]; Colorants.Red.Z = MColorants.v[2].n[0]; Colorants.Green.X = MColorants.v[0].n[1]; Colorants.Green.Y = MColorants.v[1].n[1]; Colorants.Green.Z = MColorants.v[2].n[1]; Colorants.Blue.X = MColorants.v[0].n[2]; Colorants.Blue.Y = MColorants.v[1].n[2]; Colorants.Blue.Z = MColorants.v[2].n[2]; if (!cmsWriteTag(hICC, cmsSigRedColorantTag, (void*) &Colorants.Red)) goto Error; if (!cmsWriteTag(hICC, cmsSigBlueColorantTag, (void*) &Colorants.Blue)) goto Error; if (!cmsWriteTag(hICC, cmsSigGreenColorantTag, (void*) &Colorants.Green)) goto Error; } if (TransferFunction) { // Tries to minimize space. Thanks to Richard Hughes for this nice idea if (!cmsWriteTag(hICC, cmsSigRedTRCTag, (void*) TransferFunction[0])) goto Error; if (TransferFunction[1] == TransferFunction[0]) { if (!cmsLinkTag (hICC, cmsSigGreenTRCTag, cmsSigRedTRCTag)) goto Error; } else { if (!cmsWriteTag(hICC, cmsSigGreenTRCTag, (void*) TransferFunction[1])) goto Error; } if (TransferFunction[2] == TransferFunction[0]) { if (!cmsLinkTag (hICC, cmsSigBlueTRCTag, cmsSigRedTRCTag)) goto Error; } else { if (!cmsWriteTag(hICC, cmsSigBlueTRCTag, (void*) TransferFunction[2])) goto Error; } } if (Primaries) { if (!cmsWriteTag(hICC, cmsSigChromaticityTag, (void*) Primaries)) goto Error; } return hICC; Error: if (hICC) cmsCloseProfile(hICC); return NULL; }
cmsHPROFILE LCMSEXPORT f_cmsCreateBCHSWabstractProfile(int nLUTPoints, double Exposure, double Bright, double Contrast, double Hue, double Saturation, LPcmsCIExyY current_wp, LPcmsCIExyY destination_wp, LPGAMMATABLE Tables []) { cmsHPROFILE hICC; LPLUT Lut; BCHSWADJUSTS bchsw; cmsCIExyY WhitePnt; bchsw.Exposure = Exposure; bchsw.Brightness = Bright; bchsw.Contrast = Contrast; bchsw.Hue = Hue; bchsw.Saturation = Saturation; cmsxyY2XYZ(&bchsw.WPsrc, current_wp); cmsxyY2XYZ(&bchsw.WPdest, destination_wp); hICC = _cmsCreateProfilePlaceholder(); if (!hICC) // can't allocate return NULL; cmsSetDeviceClass(hICC, icSigAbstractClass); cmsSetColorSpace(hICC, icSigLabData); cmsSetPCS(hICC, icSigLabData); cmsSetRenderingIntent(hICC, INTENT_PERCEPTUAL); // Creates a LUT with 3D grid only Lut = cmsAllocLUT(); cmsAlloc3DGrid(Lut, nLUTPoints, 3, 3); if (Tables != NULL) cmsAllocLinearTable (Lut, Tables, 1); if (!cmsSample3DGrid(Lut, bchswSampler, (LPVOID) &bchsw, 0)) { // Shouldn't reach here cmsFreeLUT(Lut); cmsCloseProfile(hICC); return NULL; } // Create tags cmsAddTag(hICC, icSigDeviceMfgDescTag, (LPVOID) "(f-spot internal)"); cmsAddTag(hICC, icSigProfileDescriptionTag, (LPVOID) "f-spot BCHSW abstract profile"); cmsAddTag(hICC, icSigDeviceModelDescTag, (LPVOID) "BCHSW built-in"); cmsAddTag(hICC, icSigMediaWhitePointTag, (LPVOID) cmsD50_XYZ()); cmsAddTag(hICC, icSigAToB0Tag, (LPVOID) Lut); // LUT is already on virtual profile cmsFreeLUT(Lut); // Ok, done return hICC; }