C++ cmsGetPCS函数代码示例

// Create an output MPE LUT from agiven profile. Version mismatches are handled here
cmsPipeline* _cmsReadOutputLUT(cmsHPROFILE hProfile, int Intent)
{
    cmsTagTypeSignature OriginalType;
    cmsTagSignature tag16    = PCS2Device16[Intent];
    cmsTagSignature tagFloat = PCS2DeviceFloat[Intent];
    cmsContext ContextID     = cmsGetProfileContextID(hProfile);

    if (cmsIsTag(hProfile, tagFloat)) {  // Float tag takes precedence

        // Floating point LUT are always V4, so no adjustment is required
        return cmsPipelineDup((cmsPipeline*) cmsReadTag(hProfile, tagFloat));
    }

    // Revert to perceptual if no tag is found
    if (!cmsIsTag(hProfile, tag16)) {
        tag16 = PCS2Device16[0];
    }

    if (cmsIsTag(hProfile, tag16)) { // Is there any LUT-Based table?

        // Check profile version and LUT type. Do the necessary adjustments if needed

        // First read the tag
        cmsPipeline* Lut = (cmsPipeline*) cmsReadTag(hProfile, tag16);
        if (Lut == NULL) return NULL;

        // After reading it, we have info about the original type
        OriginalType =  _cmsGetTagTrueType(hProfile, tag16);

        // The profile owns the Lut, so we need to copy it
        Lut = cmsPipelineDup(Lut);
        if (Lut == NULL) return NULL;

        // Now it is time for a controversial stuff. I found that for 3D LUTS using 
        // Lab used as indexer space,  trilinear interpolation should be used         
        if (cmsGetPCS(hProfile) == cmsSigLabData)
                             ChangeInterpolationToTrilinear(Lut);       

        // We need to adjust data only for Lab and Lut16 type
        if (OriginalType != cmsSigLut16Type || cmsGetPCS(hProfile) != cmsSigLabData) 
            return Lut;

        // Add a matrix for conversion V4 to V2 Lab PCS
        cmsPipelineInsertStage(Lut, cmsAT_BEGIN, _cmsStageAllocLabV4ToV2(ContextID));
        return Lut;
    }   

    // Lut not found, try to create a matrix-shaper

    // Check if this is a grayscale profile.
     if (cmsGetColorSpace(hProfile) == cmsSigGrayData) {

              // if so, build appropiate conversion tables. 
              // The tables are the PCS iluminant, scaled across GrayTRC
              return BuildGrayOutputPipeline(hProfile);              
    }

    // Not gray, create a normal matrix-shaper 
    return BuildRGBOutputMatrixShaper(hProfile);
}

/*static
cmsPipeline* _cmsReadFloatInputTag(cmsHPROFILE hProfile, cmsTagSignature tagFloat)
{
    cmsContext ContextID       = cmsGetProfileContextID(hProfile);
    cmsPipeline* Lut           = cmsPipelineDup((cmsPipeline*) cmsReadTag(hProfile, tagFloat));
    cmsColorSpaceSignature spc = cmsGetColorSpace(hProfile);

    if (Lut == NULL) return NULL;

    // If PCS is Lab or XYZ, the floating point tag is accepting data in the space encoding,
    // and since the formatter has already accomodated to 0..1.0, we should undo this change
    if ( spc == cmsSigLabData)
    {
        cmsPipelineInsertStage(Lut, cmsAT_END, _cmsStageNormalizeFromLabFloat(ContextID));
    }
    else
        if (spc == cmsSigXYZData)
        {
            cmsPipelineInsertStage(Lut, cmsAT_END, _cmsStageNormalizeFromXyzFloat(ContextID));
        }

    return Lut;
}
*/
static
cmsPipeline* _cmsReadFloatInputTag(cmsHPROFILE hProfile, cmsTagSignature tagFloat)
{
    cmsContext ContextID       = cmsGetProfileContextID(hProfile);
    cmsPipeline* Lut           = cmsPipelineDup((cmsPipeline*) cmsReadTag(hProfile, tagFloat));
    cmsColorSpaceSignature spc = cmsGetColorSpace(hProfile);
    cmsColorSpaceSignature PCS = cmsGetPCS(hProfile);

    if (Lut == NULL) return NULL;

    // input and output of transform are in lcms 0..1 encoding.  If XYZ or Lab spaces are used,
    //  these need to be normalized into the appropriate ranges (Lab = 100,0,0, XYZ=1.0,1.0,1.0)
    if ( spc == cmsSigLabData)
    {
        cmsPipelineInsertStage(Lut, cmsAT_BEGIN, _cmsStageNormalizeToLabFloat(ContextID));
    }
    else if (spc == cmsSigXYZData)
    {
        cmsPipelineInsertStage(Lut, cmsAT_BEGIN, _cmsStageNormalizeToXyzFloat(ContextID));
    }

    if ( PCS == cmsSigLabData)
    {
        cmsPipelineInsertStage(Lut, cmsAT_END, _cmsStageNormalizeFromLabFloat(ContextID));
    }
    else if( PCS == cmsSigXYZData)
    {
        cmsPipelineInsertStage(Lut, cmsAT_END, _cmsStageNormalizeFromXyzFloat(ContextID));
    }

    return Lut;
}

static
cmsPipeline* _cmsReadFloatOutputTag(cmsHPROFILE hProfile, cmsTagSignature tagFloat)
{
    cmsContext ContextID       = cmsGetProfileContextID(hProfile);
    cmsPipeline* Lut           = cmsPipelineDup((cmsPipeline*) cmsReadTag(hProfile, tagFloat));
    cmsColorSpaceSignature PCS = cmsGetPCS(hProfile);
    cmsColorSpaceSignature dataSpace = cmsGetColorSpace(hProfile);

    if (Lut == NULL) return NULL;

    // If PCS is Lab or XYZ, the floating point tag is accepting data in the space encoding,
    // and since the formatter has already accomodated to 0..1.0, we should undo this change
    if ( PCS == cmsSigLabData)
    {
        cmsPipelineInsertStage(Lut, cmsAT_BEGIN, _cmsStageNormalizeToLabFloat(ContextID));
    }
    else
        if (PCS == cmsSigXYZData)
        {
            cmsPipelineInsertStage(Lut, cmsAT_BEGIN, _cmsStageNormalizeToXyzFloat(ContextID));
        }

    // the output can be Lab or XYZ, in which case normalisation is needed on the end of the pipeline
    if ( dataSpace == cmsSigLabData)
    {
        cmsPipelineInsertStage(Lut, cmsAT_END, _cmsStageNormalizeFromLabFloat(ContextID));
    }
    else if ( dataSpace == cmsSigXYZData)
    {
        cmsPipelineInsertStage(Lut, cmsAT_END, _cmsStageNormalizeFromXyzFloat(ContextID));
    }

    return Lut;
}

// Read the AToD0 tag, adjusting the encoding of Lab or XYZ if neded
static
cmsPipeline* _cmsReadFloatDevicelinkTag(cmsHPROFILE hProfile, cmsTagSignature tagFloat)
{
    cmsContext ContextID       = cmsGetProfileContextID(hProfile);
    cmsPipeline* Lut           = cmsPipelineDup((cmsPipeline*) cmsReadTag(hProfile, tagFloat));
    cmsColorSpaceSignature PCS = cmsGetPCS(hProfile);
    cmsColorSpaceSignature spc = cmsGetColorSpace(hProfile);

    if (Lut == NULL) return NULL;

    if (spc == cmsSigLabData)
    {
        cmsPipelineInsertStage(Lut, cmsAT_BEGIN, _cmsStageNormalizeToLabFloat(ContextID));
    }
    else
        if (spc == cmsSigXYZData)
        {
            cmsPipelineInsertStage(Lut, cmsAT_BEGIN, _cmsStageNormalizeToXyzFloat(ContextID));
        }

        if (PCS == cmsSigLabData)
        {
            cmsPipelineInsertStage(Lut, cmsAT_END, _cmsStageNormalizeFromLabFloat(ContextID));
        }
        else
            if (PCS == cmsSigXYZData)
            {
                cmsPipelineInsertStage(Lut, cmsAT_END, _cmsStageNormalizeFromXyzFloat(ContextID));
            }

            return Lut;
}

static
int GetDevicelinkColorSpace(cmsHPROFILE hProfile)
{
    cmsColorSpaceSignature ProfileSpace = cmsGetPCS(hProfile);

	return _cmsLCMScolorSpace(ProfileSpace);
}

static PyObject*  
cms_profile_getattro(CmsProfileObject* self, PyObject* name)
{
    PyObject* name_bytes;
    char* name_string;

    if (!PyUnicode_Check(name))
        return NULL;
   
    if (!(name_bytes = PyUnicode_AsASCIIString(name)))
        return NULL;

    if (!(name_string = PyBytes_AsString(name_bytes)))
        return NULL;

    if (!strcmp(name_string, "product_name"))
        return PyUnicode_FromFormat("%s", cmsTakeProductName(self->profile));
    if (!strcmp(name_string, "product_desc"))
        return PyUnicode_FromFormat("%s", cmsTakeProductDesc(self->profile));
    if (!strcmp(name_string, "product_info"))
        return PyUnicode_FromFormat("%s", cmsTakeProductInfo(self->profile));
    if (!strcmp(name_string, "rendering_intent"))
        return PyLong_FromLong(cmsTakeRenderingIntent(self->profile));
    if (!strcmp(name_string, "pcs"))
        return PyUnicode_FromFormat("%s", findICmode(cmsGetPCS(self->profile)));
    if (!strcmp(name_string, "color_space"))
        return PyUnicode_FromFormat("%s",
                findICmode(cmsGetColorSpace(self->profile)));
    /* FIXME: add more properties (creation_datetime etc) */

    return PyObject_GenericGetAttr((PyObject*)self, name);
}

static
cmsPipeline* BuildGrayOutputPipeline(cmsHPROFILE hProfile)
{
    cmsToneCurve *GrayTRC, *RevGrayTRC;
    cmsPipeline* Lut;
    cmsContext ContextID = cmsGetProfileContextID(hProfile);

    GrayTRC = (cmsToneCurve *) cmsReadTag(hProfile, cmsSigGrayTRCTag);
    if (GrayTRC == NULL) return NULL;

    RevGrayTRC = cmsReverseToneCurve(GrayTRC);
    if (RevGrayTRC == NULL) return NULL;

    Lut = cmsPipelineAlloc(ContextID, 3, 1);
    if (Lut == NULL) {
        cmsFreeToneCurve(RevGrayTRC);
        return NULL;
    }

    if (cmsGetPCS(hProfile) == cmsSigLabData) {

        cmsPipelineInsertStage(Lut, cmsAT_END, cmsStageAllocMatrix(ContextID, 1,  3, PickLstarMatrix, NULL));
    }
    else  {
        cmsPipelineInsertStage(Lut, cmsAT_END, cmsStageAllocMatrix(ContextID, 1,  3, PickYMatrix, NULL));
    }

    cmsPipelineInsertStage(Lut, cmsAT_END, cmsStageAllocToneCurves(ContextID, 1, &RevGrayTRC));
    cmsFreeToneCurve(RevGrayTRC);

    return Lut;
}

/* Get the number of output channels for the profile */
int
gscms_get_output_channel_count(gcmmhprofile_t profile)
{
    icColorSpaceSignature colorspace;

    colorspace = cmsGetPCS(profile);
    return(_cmsChannelsOf(colorspace));
}

// Read and create a BRAND NEW MPE LUT from a given profile. All stuff dependent of version, etc
// is adjusted here in order to create a LUT that takes care of all those details
cmsPipeline* _cmsReadInputLUT(cmsHPROFILE hProfile, int Intent)
{
    cmsTagTypeSignature OriginalType;
    cmsTagSignature tag16    = Device2PCS16[Intent];
    cmsTagSignature tagFloat = Device2PCSFloat[Intent];
    cmsContext ContextID = cmsGetProfileContextID(hProfile);

    if (cmsIsTag(hProfile, tagFloat)) {  // Float tag takes precedence

        // Floating point LUT are always V4, so no adjustment is required
        return cmsPipelineDup((cmsPipeline*) cmsReadTag(hProfile, tagFloat));
    }

    // Revert to perceptual if no tag is found
    if (!cmsIsTag(hProfile, tag16)) {
        tag16 = Device2PCS16[0];
    }

    if (cmsIsTag(hProfile, tag16)) { // Is there any LUT-Based table?

        // Check profile version and LUT type. Do the necessary adjustments if needed

        // First read the tag
        cmsPipeline* Lut = (cmsPipeline*) cmsReadTag(hProfile, tag16);
        if (Lut == NULL) return NULL;

        // After reading it, we have now info about the original type
        OriginalType =  _cmsGetTagTrueType(hProfile, tag16);

        // The profile owns the Lut, so we need to copy it
        Lut = cmsPipelineDup(Lut);

        // We need to adjust data only for Lab16 on output
        if (OriginalType != cmsSigLut16Type || cmsGetPCS(hProfile) != cmsSigLabData) 
            return Lut;

        // If the input is Lab, add also a conversion at the begin
        if (cmsGetColorSpace(hProfile) == cmsSigLabData)
            cmsPipelineInsertStage(Lut, cmsAT_BEGIN, _cmsStageAllocLabV4ToV2(ContextID));

        // Add a matrix for conversion V2 to V4 Lab PCS
        cmsPipelineInsertStage(Lut, cmsAT_END, _cmsStageAllocLabV2ToV4(ContextID));
        return Lut;
    }   

    // Lut was not found, try to create a matrix-shaper

    // Check if this is a grayscale profile.
    if (cmsGetColorSpace(hProfile) == cmsSigGrayData) {

        // if so, build appropiate conversion tables. 
        // The tables are the PCS iluminant, scaled across GrayTRC
        return BuildGrayInputMatrixPipeline(hProfile);              
    }

    // Not gray, create a normal matrix-shaper 
    return BuildRGBInputMatrixShaper(hProfile);
}

static
cmsPipeline* BuildRGBOutputMatrixShaper(cmsHPROFILE hProfile)
{
    cmsPipeline* Lut;
    cmsToneCurve *Shapes[3], *InvShapes[3];
    cmsMAT3 Mat, Inv;
    int i, j;
    cmsContext ContextID = cmsGetProfileContextID(hProfile);

    if (!ReadICCMatrixRGB2XYZ(&Mat, hProfile))
        return NULL;

    if (!_cmsMAT3inverse(&Mat, &Inv))
        return NULL;

    // XYZ PCS in encoded in 1.15 format, and the matrix input should come in 0..0xffff range, so
    // we need to adjust the input by a << 1 to obtain a 1.16 fixed and then by a factor of
    // (0xffff/0x10000) to put data in 0..0xffff range. Total factor is (2.0*65535.0)/65536.0;

    for (i=0; i < 3; i++)
        for (j=0; j < 3; j++)
            Inv.v[i].n[j] *= OutpAdj;

    Shapes[0] = (cmsToneCurve *) cmsReadTag(hProfile, cmsSigRedTRCTag);
    Shapes[1] = (cmsToneCurve *) cmsReadTag(hProfile, cmsSigGreenTRCTag);
    Shapes[2] = (cmsToneCurve *) cmsReadTag(hProfile, cmsSigBlueTRCTag);

    if (!Shapes[0] || !Shapes[1] || !Shapes[2])
        return NULL;

    InvShapes[0] = cmsReverseToneCurve(Shapes[0]);
    InvShapes[1] = cmsReverseToneCurve(Shapes[1]);
    InvShapes[2] = cmsReverseToneCurve(Shapes[2]);

    if (!InvShapes[0] || !InvShapes[1] || !InvShapes[2]) {
        return NULL;
    }

    Lut = cmsPipelineAlloc(ContextID, 3, 3);
    if (Lut != NULL) {

        // Note that it is certainly possible a single profile would have a LUT based
        // tag for output working in lab and a matrix-shaper for the fallback cases.
        // This is not allowed by the spec, but this code is tolerant to those cases
        if (cmsGetPCS(hProfile) == cmsSigLabData) {

             cmsPipelineInsertStage(Lut, cmsAT_END, _cmsStageAllocLab2XYZ(ContextID));
        }

        cmsPipelineInsertStage(Lut, cmsAT_END, cmsStageAllocMatrix(ContextID, 3, 3, (cmsFloat64Number*) &Inv, NULL));
        cmsPipelineInsertStage(Lut, cmsAT_END, cmsStageAllocToneCurves(ContextID, 3, InvShapes));
    }

    cmsFreeToneCurveTriple(InvShapes);
    return Lut;
}

/* Get the link from the CMS, but include proofing and/or a device link  
   profile. */
gcmmhlink_t
gscms_get_link_proof_devlink(gcmmhprofile_t lcms_srchandle,
                             gcmmhprofile_t lcms_proofhandle,
                             gcmmhprofile_t lcms_deshandle, 
                             gcmmhprofile_t lcms_devlinkhandle, 
                             gsicc_rendering_param_t *rendering_params,
                             bool src_dev_link, int cmm_flags,
                             gs_memory_t *mem)
{
    DWORD src_data_type,des_data_type;
    icColorSpaceSignature src_color_space,des_color_space;
    int src_nChannels,des_nChannels;
    int lcms_src_color_space, lcms_des_color_space;
    cmsHPROFILE hProfiles[5]; 
    int nProfiles = 0;

   /* First handle all the source stuff */
    src_color_space  = cmsGetColorSpace(lcms_srchandle);
    lcms_src_color_space = _cmsLCMScolorSpace(src_color_space);
    /* littlecms returns -1 for types it does not (but should) understand */
    if (lcms_src_color_space < 0) lcms_src_color_space = 0;
    src_nChannels = _cmsChannelsOf(src_color_space);
    /* For now, just do single byte data, interleaved.  We can change this
      when we use the transformation. */
    src_data_type = (COLORSPACE_SH(lcms_src_color_space)|
                        CHANNELS_SH(src_nChannels)|BYTES_SH(2));    
    if (lcms_deshandle != NULL) {
        des_color_space  = cmsGetColorSpace(lcms_deshandle);
    } else {
        /* We must have a device link profile. */
        des_color_space = cmsGetPCS(lcms_deshandle);
    }
    lcms_des_color_space = _cmsLCMScolorSpace(des_color_space);
    if (lcms_des_color_space < 0) lcms_des_color_space = 0;
    des_nChannels = _cmsChannelsOf(des_color_space);
    des_data_type = (COLORSPACE_SH(lcms_des_color_space)|
                        CHANNELS_SH(des_nChannels)|BYTES_SH(2));
    /* lcms proofing transform has a clunky API and can't include the device 
       link profile if we have both. So use cmsCreateMultiprofileTransform 
       instead and round trip the proofing profile. */
    hProfiles[nProfiles++] = lcms_srchandle;
    if (lcms_proofhandle != NULL) {
        hProfiles[nProfiles++] = lcms_proofhandle;
        hProfiles[nProfiles++] = lcms_proofhandle;
    }
    hProfiles[nProfiles++] = lcms_deshandle;
    if (lcms_devlinkhandle != NULL) {
        hProfiles[nProfiles++] = lcms_devlinkhandle;
    }
    return(cmsCreateMultiprofileTransform(hProfiles, nProfiles, src_data_type, 
                                          des_data_type, rendering_params->rendering_intent, 
                                          (cmm_flags | cmsFLAGS_BLACKPOINTCOMPENSATION | 
                                           cmsFLAGS_HIGHRESPRECALC |
                                           cmsFLAGS_NOTCACHE)));
}

// This one includes abstract profiles as well. Matrix-shaper cannot be obtained on that device class. The
// tag name here may default to AToB0
cmsPipeline* _cmsReadDevicelinkLUT(cmsHPROFILE hProfile, int Intent)
{
    cmsPipeline* Lut;
    cmsTagTypeSignature OriginalType;
    cmsTagSignature tag16    = Device2PCS16[Intent];
    cmsTagSignature tagFloat = Device2PCSFloat[Intent];
    cmsContext ContextID = cmsGetProfileContextID(hProfile);

    if (cmsIsTag(hProfile, tagFloat)) {  // Float tag takes precedence

        // Floating point LUT are always V4, no adjustment is required
        return cmsPipelineDup((cmsPipeline*) cmsReadTag(hProfile, tagFloat));
    }

    tagFloat = Device2PCSFloat[0];
    if (cmsIsTag(hProfile, tagFloat)) {

        return cmsPipelineDup((cmsPipeline*) cmsReadTag(hProfile, tagFloat));
    }

    if (!cmsIsTag(hProfile, tag16)) {  // Is there any LUT-Based table?

        tag16    = Device2PCS16[0];
        if (!cmsIsTag(hProfile, tag16)) return NULL;
    }

    // Check profile version and LUT type. Do the necessary adjustments if needed

    // Read the tag
    Lut = (cmsPipeline*) cmsReadTag(hProfile, tag16);
    if (Lut == NULL) return NULL;

    // The profile owns the Lut, so we need to copy it
    Lut = cmsPipelineDup(Lut);

    // After reading it, we have info about the original type
    OriginalType =  _cmsGetTagTrueType(hProfile, tag16);

    // We need to adjust data for Lab16 on output
    if (OriginalType != cmsSigLut16Type) return Lut;

    // Here it is possible to get Lab on both sides

    if (cmsGetPCS(hProfile) == cmsSigLabData) {
            cmsPipelineInsertStage(Lut, cmsAT_BEGIN, _cmsStageAllocLabV4ToV2(ContextID));
    }

    if (cmsGetColorSpace(hProfile) == cmsSigLabData) {
            cmsPipelineInsertStage(Lut, cmsAT_END, _cmsStageAllocLabV2ToV4(ContextID));
    }

    return Lut;


}

// Gray input pipeline
static
cmsPipeline* BuildGrayInputMatrixPipeline(cmsHPROFILE hProfile)
{
    cmsToneCurve *GrayTRC;
    cmsPipeline* Lut;
    cmsContext ContextID = cmsGetProfileContextID(hProfile);

    GrayTRC = (cmsToneCurve *) cmsReadTag(hProfile, cmsSigGrayTRCTag);
    if (GrayTRC == NULL) return NULL;

    Lut = cmsPipelineAlloc(ContextID, 1, 3);
    if (Lut == NULL)
        goto Error;

    if (cmsGetPCS(hProfile) == cmsSigLabData) {

        // In this case we implement the profile as an  identity matrix plus 3 tone curves
        cmsUInt16Number Zero[2] = { 0x8080, 0x8080 };
        cmsToneCurve* EmptyTab;
        cmsToneCurve* LabCurves[3];

        EmptyTab = cmsBuildTabulatedToneCurve16(ContextID, 2, Zero);

        if (EmptyTab == NULL)
            goto Error;

        LabCurves[0] = GrayTRC;
        LabCurves[1] = EmptyTab;
        LabCurves[2] = EmptyTab;

        if (!cmsPipelineInsertStage(Lut, cmsAT_END, cmsStageAllocMatrix(ContextID, 3,  1, OneToThreeInputMatrix, NULL)) ||
            !cmsPipelineInsertStage(Lut, cmsAT_END, cmsStageAllocToneCurves(ContextID, 3, LabCurves))) {
                cmsFreeToneCurve(EmptyTab);
                goto Error;
        }

        cmsFreeToneCurve(EmptyTab);

    }
    else  {

        if (!cmsPipelineInsertStage(Lut, cmsAT_END, cmsStageAllocToneCurves(ContextID, 1, &GrayTRC)) ||
            !cmsPipelineInsertStage(Lut, cmsAT_END, cmsStageAllocMatrix(ContextID, 3,  1, GrayInputMatrix, NULL)))
            goto Error;
    }

    return Lut;

Error:
    cmsFreeToneCurve(GrayTRC);
    cmsPipelineFree(Lut);
    return NULL;
}

// RGB Matrix shaper
static
cmsPipeline* BuildRGBInputMatrixShaper(cmsHPROFILE hProfile)
{
    cmsPipeline* Lut;
    cmsMAT3 Mat;
    cmsToneCurve *Shapes[3];
    cmsContext ContextID = cmsGetProfileContextID(hProfile);
    int i, j;

    if (!ReadICCMatrixRGB2XYZ(&Mat, hProfile)) return NULL;

    // XYZ PCS in encoded in 1.15 format, and the matrix output comes in 0..0xffff range, so
    // we need to adjust the output by a factor of (0x10000/0xffff) to put data in
    // a 1.16 range, and then a >> 1 to obtain 1.15. The total factor is (65536.0)/(65535.0*2)

    for (i=0; i < 3; i++)
        for (j=0; j < 3; j++)
            Mat.v[i].n[j] *= InpAdj;


    Shapes[0] = (cmsToneCurve *) cmsReadTag(hProfile, cmsSigRedTRCTag);
    Shapes[1] = (cmsToneCurve *) cmsReadTag(hProfile, cmsSigGreenTRCTag);
    Shapes[2] = (cmsToneCurve *) cmsReadTag(hProfile, cmsSigBlueTRCTag);

    if (!Shapes[0] || !Shapes[1] || !Shapes[2])
        return NULL;

    Lut = cmsPipelineAlloc(ContextID, 3, 3);
    if (Lut != NULL) {

        if (!cmsPipelineInsertStage(Lut, cmsAT_END, cmsStageAllocToneCurves(ContextID, 3, Shapes)) ||
            !cmsPipelineInsertStage(Lut, cmsAT_END, cmsStageAllocMatrix(ContextID, 3, 3, (cmsFloat64Number*) &Mat, NULL)))
            goto Error;

        // Note that it is certainly possible a single profile would have a LUT based
        // tag for output working in lab and a matrix-shaper for the fallback cases. 
        // This is not allowed by the spec, but this code is tolerant to those cases    
        if (cmsGetPCS(hProfile) == cmsSigLabData) {

            if (!cmsPipelineInsertStage(Lut, cmsAT_END, _cmsStageAllocXYZ2Lab(ContextID)))
                goto Error;
        }

    }

    return Lut;

Error:
    cmsPipelineFree(Lut);
    return NULL;
}

static PyObject*
cms_profile_getattr(CmsProfileObject* self, char* name)
{
#ifdef PY3
    if (!strcmp(name, "product_name"))
        return PyUnicode_DecodeFSDefault(cmsTakeProductName(self->profile));
    if (!strcmp(name, "product_desc"))
        return PyUnicode_DecodeFSDefault(cmsTakeProductDesc(self->profile));
    if (!strcmp(name, "product_info"))
        return PyUnicode_DecodeFSDefault(cmsTakeProductInfo(self->profile));
    if (!strcmp(name, "rendering_intent"))
        return PyLong_FromLong(cmsTakeRenderingIntent(self->profile));
    if (!strcmp(name, "pcs"))
        return PyUnicode_DecodeFSDefault(findICmode(cmsGetPCS(self->profile)));
    if (!strcmp(name, "color_space"))
        return PyUnicode_DecodeFSDefault(findICmode(cmsGetColorSpace(self->profile)));
    /* FIXME: add more properties (creation_datetime etc) */

    return PyObject_GenericGetAttr((PyObject *)self,
                                   PyUnicode_DecodeFSDefault(name));
#else
    if (!strcmp(name, "product_name"))
        return PyString_FromString(cmsTakeProductName(self->profile));
    if (!strcmp(name, "product_desc"))
        return PyString_FromString(cmsTakeProductDesc(self->profile));
    if (!strcmp(name, "product_info"))
        return PyString_FromString(cmsTakeProductInfo(self->profile));
    if (!strcmp(name, "rendering_intent"))
        return PyInt_FromLong(cmsTakeRenderingIntent(self->profile));
    if (!strcmp(name, "pcs"))
        return PyString_FromString(findICmode(cmsGetPCS(self->profile)));
    if (!strcmp(name, "color_space"))
        return PyString_FromString(findICmode(cmsGetColorSpace(self->profile)));
    /* FIXME: add more properties (creation_datetime etc) */

    return Py_FindMethod(cms_profile_methods, (PyObject*) self, name);
#endif
}