diff options
Diffstat (limited to 'src/cmssamp.c')
| -rw-r--r-- | src/cmssamp.c | 176 |
1 files changed, 88 insertions, 88 deletions
diff --git a/src/cmssamp.c b/src/cmssamp.c index 420003e..b2dd2e8 100644 --- a/src/cmssamp.c +++ b/src/cmssamp.c @@ -3,22 +3,22 @@ // Little Color Management System // Copyright (c) 1998-2010 Marti Maria Saguer // -// Permission is hereby granted, free of charge, to any person obtaining -// a copy of this software and associated documentation files (the "Software"), -// to deal in the Software without restriction, including without limitation -// the rights to use, copy, modify, merge, publish, distribute, sublicense, -// and/or sell copies of the Software, and to permit persons to whom the Software +// Permission is hereby granted, free of charge, to any person obtaining +// a copy of this software and associated documentation files (the "Software"), +// to deal in the Software without restriction, including without limitation +// the rights to use, copy, modify, merge, publish, distribute, sublicense, +// and/or sell copies of the Software, and to permit persons to whom the Software // is furnished to do so, subject to the following conditions: // -// The above copyright notice and this permission notice shall be included in +// The above copyright notice and this permission notice shall be included in // all copies or substantial portions of the Software. // -// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, -// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO -// THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND -// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE -// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION -// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION +// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, +// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO +// THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND +// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE +// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION +// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION // WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. // //--------------------------------------------------------------------------------- @@ -29,12 +29,12 @@ // This file contains routines for resampling and LUT optimization, black point detection -// and black preservation. +// and black preservation. // Black point detection ------------------------------------------------------------------------- -// PCS -> PCS round trip transform, always uses relative intent on the device -> pcs +// PCS -> PCS round trip transform, always uses relative intent on the device -> pcs static cmsHTRANSFORM CreateRoundtripXForm(cmsHPROFILE hProfile, cmsUInt32Number nIntent) { @@ -49,7 +49,7 @@ cmsHTRANSFORM CreateRoundtripXForm(cmsHPROFILE hProfile, cmsUInt32Number nIntent hProfiles[0] = hLab; hProfiles[1] = hProfile; hProfiles[2] = hProfile; hProfiles[3] = hLab; Intents[0] = INTENT_RELATIVE_COLORIMETRIC; Intents[1] = nIntent; Intents[2] = INTENT_RELATIVE_COLORIMETRIC; Intents[3] = INTENT_RELATIVE_COLORIMETRIC; - xform = cmsCreateExtendedTransform(ContextID, 4, hProfiles, BPC, Intents, + xform = cmsCreateExtendedTransform(ContextID, 4, hProfiles, BPC, Intents, States, NULL, 0, TYPE_Lab_DBL, TYPE_Lab_DBL, cmsFLAGS_NOCACHE|cmsFLAGS_NOOPTIMIZE); cmsCloseProfile(hLab); @@ -59,7 +59,7 @@ cmsHTRANSFORM CreateRoundtripXForm(cmsHPROFILE hProfile, cmsUInt32Number nIntent // 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, +cmsBool BlackPointAsDarkerColorant(cmsHPROFILE hInput, cmsUInt32Number Intent, cmsCIEXYZ* BlackPoint, cmsUInt32Number dwFlags) @@ -68,28 +68,28 @@ cmsBool BlackPointAsDarkerColorant(cmsHPROFILE hInput, cmsHTRANSFORM xform; cmsColorSpaceSignature Space; cmsUInt32Number nChannels; - cmsUInt32Number dwFormat; + cmsUInt32Number dwFormat; cmsHPROFILE hLab; cmsCIELab Lab; - cmsCIEXYZ BlackXYZ; + cmsCIEXYZ BlackXYZ; cmsContext ContextID = cmsGetProfileContextID(hInput); - - // If the profile does not support input direction, assume Black point 0 + + // 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, FALSE); - // Try to get black by using black colorant + // 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; } @@ -103,21 +103,21 @@ cmsBool BlackPointAsDarkerColorant(cmsHPROFILE hInput, hLab = cmsCreateLab2ProfileTHR(ContextID, NULL); if (hLab == NULL) { BlackPoint -> X = BlackPoint ->Y = BlackPoint -> Z = 0.0; - return FALSE; + 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); @@ -125,38 +125,38 @@ cmsBool BlackPointAsDarkerColorant(cmsHPROFILE hInput, Lab.a = Lab.b = 0; if (Lab.L > 50) Lab.L = 50; - // Free the resources + // 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); } -// Get a black point of output CMYK profile, discounting any ink-limiting embedded +// Get a black point of output CMYK profile, discounting any ink-limiting embedded // in the profile. For doing that, we use perceptual intent in input direction: // Lab (0, 0, 0) -> [Perceptual] Profile -> CMYK -> [Rel. colorimetric] Profile -> Lab static cmsBool BlackPointUsingPerceptualBlack(cmsCIEXYZ* BlackPoint, cmsHPROFILE hProfile) - -{ - cmsHTRANSFORM hRoundTrip; + +{ + cmsHTRANSFORM hRoundTrip; cmsCIELab LabIn, LabOut; - cmsCIEXYZ BlackXYZ; - + cmsCIEXYZ BlackXYZ; + // Is the intent supported by the profile? if (!cmsIsIntentSupported(hProfile, INTENT_PERCEPTUAL, LCMS_USED_AS_INPUT)) { BlackPoint -> X = BlackPoint ->Y = BlackPoint -> Z = 0.0; return TRUE; } - + hRoundTrip = CreateRoundtripXForm(hProfile, INTENT_PERCEPTUAL); if (hRoundTrip == NULL) { BlackPoint -> X = BlackPoint ->Y = BlackPoint -> Z = 0.0; @@ -171,10 +171,10 @@ cmsBool BlackPointUsingPerceptualBlack(cmsCIEXYZ* BlackPoint, cmsHPROFILE hProfi LabOut.a = LabOut.b = 0; cmsDeleteTransform(hRoundTrip); - + // Convert it to XYZ - cmsLab2XYZ(NULL, &BlackXYZ, &LabOut); - + cmsLab2XYZ(NULL, &BlackXYZ, &LabOut); + if (BlackPoint != NULL) *BlackPoint = BlackXYZ; @@ -182,33 +182,33 @@ cmsBool BlackPointUsingPerceptualBlack(cmsCIEXYZ* BlackPoint, cmsHPROFILE hProfi } // This function shouldn't exist at all -- there is such quantity of broken -// profiles on black point tag, that we must somehow fix chromaticity to +// profiles on black point tag, that we must somehow fix chromaticity to // avoid huge tint when doing Black point compensation. This function does -// just that. There is a special flag for using black point tag, but turned -// off by default because it is bogus on most profiles. The detection algorithm -// involves to turn BP to neutral and to use only L component. +// just that. There is a special flag for using black point tag, but turned +// off by default because it is bogus on most profiles. The detection algorithm +// involves to turn BP to neutral and to use only L component. 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; + return FALSE; } - // v4 + perceptual & saturation intents does have its own black point, and it is + // 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) && + if ((cmsGetEncodedICCversion(hProfile) >= 0x4000000) && (Intent == INTENT_PERCEPTUAL || Intent == INTENT_SATURATION)) { // Matrix shaper share MRC & perceptual intents - if (cmsIsMatrixShaper(hProfile)) + 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 -> X = cmsPERCEPTUAL_BLACK_X; BlackPoint -> Y = cmsPERCEPTUAL_BLACK_Y; BlackPoint -> Z = cmsPERCEPTUAL_BLACK_Z; @@ -219,13 +219,13 @@ cmsBool CMSEXPORT cmsDetectBlackPoint(cmsCIEXYZ* BlackPoint, cmsHPROFILE hProfil #ifdef CMS_USE_PROFILE_BLACK_POINT_TAG // v2, v4 rel/abs colorimetric - if (cmsIsTag(hProfile, cmsSigMediaBlackPointTag) && + if (cmsIsTag(hProfile, cmsSigMediaBlackPointTag) && Intent == INTENT_RELATIVE_COLORIMETRIC) { cmsCIEXYZ *BlackPtr, BlackXYZ, UntrustedBlackPoint, TrustedBlackPoint, MediaWhite; cmsCIELab Lab; - // If black point is specified, then use it, + // If black point is specified, then use it, BlackPtr = cmsReadTag(hProfile, cmsSigMediaBlackPointTag); if (BlackPtr != NULL) { @@ -244,16 +244,16 @@ cmsBool CMSEXPORT cmsDetectBlackPoint(cmsCIEXYZ* BlackPoint, cmsHPROFILE hProfil if (BlackPoint != NULL) *BlackPoint = TrustedBlackPoint; - + return TRUE; } } #endif - // That is about v2 profiles. + // That is about v2 profiles. // If output profile, discount ink-limiting and that's all - if (Intent == INTENT_RELATIVE_COLORIMETRIC && + if (Intent == INTENT_RELATIVE_COLORIMETRIC && (cmsGetDeviceClass(hProfile) == cmsSigOutputClass) && (cmsGetColorSpace(hProfile) == cmsSigCmykData)) return BlackPointUsingPerceptualBlack(BlackPoint, hProfile); @@ -270,7 +270,7 @@ cmsBool CMSEXPORT cmsDetectBlackPoint(cmsCIEXYZ* BlackPoint, cmsHPROFILE hProfil // http://www.personal.psu.edu/jhm/f90/lectures/lsq2.html static -cmsFloat64Number RootOfLeastSquaresFitQuadraticCurve(int n, cmsFloat64Number x[], cmsFloat64Number y[]) +cmsFloat64Number RootOfLeastSquaresFitQuadraticCurve(int n, cmsFloat64Number x[], cmsFloat64Number y[]) { double sum_x = 0, sum_x2 = 0, sum_x3 = 0, sum_x4 = 0; double sum_y = 0, sum_yx = 0, sum_yx2 = 0; @@ -295,7 +295,7 @@ cmsFloat64Number RootOfLeastSquaresFitQuadraticCurve(int n, cmsFloat64Number x[] sum_yx += yn*xn; sum_yx2 += yn*xn*xn; } - + _cmsVEC3init(&m.v[0], n, sum_x, sum_x2); _cmsVEC3init(&m.v[1], sum_x, sum_x2, sum_x3); _cmsVEC3init(&m.v[2], sum_x2, sum_x3, sum_x4); @@ -304,12 +304,12 @@ cmsFloat64Number RootOfLeastSquaresFitQuadraticCurve(int n, cmsFloat64Number x[] if (!_cmsMAT3solve(&res, &m, &v)) return 0; - // y = t x2 + u x + c + // y = t x2 + u x + c // x = ( - u + Sqrt( u^2 - 4 t c ) ) / ( 2 t ) disc = res.n[1]*res.n[1] - 4.0 * res.n[0] * res.n[2]; if (disc < 0) return -1; - return ( -1.0 * res.n[1] + sqrt( disc )) / (2.0 * res.n[0]); + return ( -1.0 * res.n[1] + sqrt( disc )) / (2.0 * res.n[0]); } static @@ -333,21 +333,21 @@ cmsBool IsMonotonic(int n, const cmsFloat64Number Table[]) return TRUE; } -// Calculates the black point of a destination profile. -// This algorithm comes from the Adobe paper disclosing its black point compensation method. +// Calculates the black point of a destination profile. +// This algorithm comes from the Adobe paper disclosing its black point compensation method. cmsBool CMSEXPORT cmsDetectDestinationBlackPoint(cmsCIEXYZ* BlackPoint, cmsHPROFILE hProfile, cmsUInt32Number Intent, cmsUInt32Number dwFlags) -{ +{ cmsColorSpaceSignature ColorSpace; cmsHTRANSFORM hRoundTrip = NULL; cmsCIELab InitialLab, destLab, Lab; - + cmsFloat64Number MinL, MaxL; cmsBool NearlyStraightMidRange = FALSE; cmsFloat64Number L; cmsFloat64Number x[101], y[101]; cmsFloat64Number lo, hi, NonMonoMin; int n, l, i, NonMonoIndx; - + // Make sure intent is adequate if (Intent != INTENT_PERCEPTUAL && @@ -358,17 +358,17 @@ cmsBool CMSEXPORT cmsDetectDestinationBlackPoint(cmsCIEXYZ* BlackPoint, cmsHPROF } - // v4 + perceptual & saturation intents does have its own black point, and it is + // 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) && + if ((cmsGetEncodedICCversion(hProfile) >= 0x4000000) && (Intent == INTENT_PERCEPTUAL || Intent == INTENT_SATURATION)) { // Matrix shaper share MRC & perceptual intents - if (cmsIsMatrixShaper(hProfile)) + 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 -> X = cmsPERCEPTUAL_BLACK_X; BlackPoint -> Y = cmsPERCEPTUAL_BLACK_Y; BlackPoint -> Z = cmsPERCEPTUAL_BLACK_Z; return TRUE; @@ -378,9 +378,9 @@ cmsBool CMSEXPORT cmsDetectDestinationBlackPoint(cmsCIEXYZ* BlackPoint, cmsHPROF // Check if the profile is lut based and gray, rgb or cmyk (7.2 in Adobe's document) ColorSpace = cmsGetColorSpace(hProfile); if (!cmsIsCLUT(hProfile, Intent, LCMS_USED_AS_OUTPUT ) || - (ColorSpace != cmsSigGrayData && - ColorSpace != cmsSigRgbData && - ColorSpace != cmsSigCmykData)) { + (ColorSpace != cmsSigGrayData && + ColorSpace != cmsSigRgbData && + ColorSpace != cmsSigCmykData)) { // In this case, handle as input case return cmsDetectBlackPoint(BlackPoint, hProfile, Intent, dwFlags); @@ -397,7 +397,7 @@ cmsBool CMSEXPORT cmsDetectDestinationBlackPoint(cmsCIEXYZ* BlackPoint, cmsHPROF cmsCIEXYZ IniXYZ; // calculate initial Lab as source black point - if (!cmsDetectBlackPoint(&IniXYZ, hProfile, Intent, dwFlags)) { + if (!cmsDetectBlackPoint(&IniXYZ, hProfile, Intent, dwFlags)) { return FALSE; } @@ -419,7 +419,7 @@ cmsBool CMSEXPORT cmsDetectDestinationBlackPoint(cmsCIEXYZ* BlackPoint, cmsHPROF // Create a roundtrip. Define a Transform BT for all x in L*a*b* hRoundTrip = CreateRoundtripXForm(hProfile, Intent); if (hRoundTrip == NULL) return FALSE; - + // Calculate Min L* Lab = InitialLab; Lab.L = 0; @@ -435,15 +435,15 @@ cmsBool CMSEXPORT cmsDetectDestinationBlackPoint(cmsCIEXYZ* BlackPoint, cmsHPROF // Step 3 // ====== - // check if quadratic estimation needs to be done. + // check if quadratic estimation needs to be done. if (Intent == INTENT_RELATIVE_COLORIMETRIC) { // Conceptually, this code tests how close the source l and converted L are to one another in the mid-range - // of the values. If the converted ramp of L values is close enough to a straight line y=x, then InitialLab - // is good enough to be the DestinationBlackPoint, + // of the values. If the converted ramp of L values is close enough to a straight line y=x, then InitialLab + // is good enough to be the DestinationBlackPoint, NearlyStraightMidRange = TRUE; - - for (l=0; l <= 100; l++) { + + for (l=0; l <= 100; l++) { Lab.L = l; Lab.a = InitialLab.a; @@ -463,7 +463,7 @@ cmsBool CMSEXPORT cmsDetectDestinationBlackPoint(cmsCIEXYZ* BlackPoint, cmsHPROF NearlyStraightMidRange = FALSE; break; } - } + } } } else { @@ -473,16 +473,16 @@ cmsBool CMSEXPORT cmsDetectDestinationBlackPoint(cmsCIEXYZ* BlackPoint, cmsHPROF // If no furter checking is needed, we are done - if (NearlyStraightMidRange) { + if (NearlyStraightMidRange) { - cmsLab2XYZ(NULL, BlackPoint, &InitialLab); + cmsLab2XYZ(NULL, BlackPoint, &InitialLab); cmsDeleteTransform(hRoundTrip); return TRUE; } - - // The round-trip curve normally looks like a nearly constant section at the black point, + + // The round-trip curve normally looks like a nearly constant section at the black point, // with a corner and a nearly straight line to the white point. - + // STEP 4 // ======= @@ -499,7 +499,7 @@ cmsBool CMSEXPORT cmsDetectDestinationBlackPoint(cmsCIEXYZ* BlackPoint, cmsHPROF hi = 0.25; } - // Capture points for the fitting. + // Capture points for the fitting. n = 0; for (l=0; l <= 100; l++) { @@ -531,7 +531,7 @@ cmsBool CMSEXPORT cmsDetectDestinationBlackPoint(cmsCIEXYZ* BlackPoint, cmsHPROF cmsDeleteTransform(hRoundTrip); return TRUE; } - + // No suitable points, regret and use safer algorithm if (n == 0) { cmsDeleteTransform(hRoundTrip); @@ -557,7 +557,7 @@ cmsBool CMSEXPORT cmsDetectDestinationBlackPoint(cmsCIEXYZ* BlackPoint, cmsHPROF if (Lab.L < 0.0 || Lab.L > 50.0) { // clip to zero L* if the vertex is negative Lab.L = 0; } - + Lab.a = InitialLab.a; Lab.b = InitialLab.b; |