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Color adaptation for XYZ color space
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Jakub Melka
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a34ee620b9
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d607c24459
@ -234,12 +234,20 @@ bool PDFLittleCMS::fillRGBBufferFromXYZ(const PDFColor3& whitePoint, const std::
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{
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Q_ASSERT(cmsGetTransformOutputFormat(transform) == TYPE_RGB_8);
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const cmsCIEXYZ* d50WhitePoint = cmsD50_XYZ();
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std::array<float, 3> correctionCoefficients = { float(d50WhitePoint->X) / whitePoint[0], float(d50WhitePoint->Y) / whitePoint[1], float(d50WhitePoint->Z) / whitePoint[2] };
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PDFColorComponentMatrix_3x3 adaptationMatrix = PDFChromaticAdaptationXYZ::createWhitepointChromaticAdaptation(getDefaultXYZWhitepoint(), whitePoint, m_settings.colorAdaptationXYZ);
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std::vector<float> fixedColors = colors;
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for (size_t i = 0, count = fixedColors.size(); i < count; ++i)
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const size_t count = fixedColors.size() / 3;
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for (size_t i = 0; i < count; ++i)
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{
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fixedColors[i] = fixedColors[i] * correctionCoefficients[i % correctionCoefficients.size()];
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const size_t indexX = i * 3;
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const size_t indexY = i * 3 + 1;
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const size_t indexZ = i * 3 + 2;
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const PDFColor3 sourceXYZ = { fixedColors[indexX], fixedColors[indexY], fixedColors[indexZ] };
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const PDFColor3 adaptedXYZ = adaptationMatrix * sourceXYZ;
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fixedColors[indexX] = adaptedXYZ[0];
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fixedColors[indexY] = adaptedXYZ[1];
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fixedColors[indexZ] = adaptedXYZ[2];
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}
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cmsDoTransform(transform, fixedColors.data(), outputBuffer, static_cast<cmsUInt32Number>(colors.size()) / T_CHANNELS(inputFormat));
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@ -553,10 +561,8 @@ QColor PDFLittleCMS::getColorFromXYZ(const PDFColor3& whitePoint, const PDFColor
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{
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Q_ASSERT(cmsGetTransformOutputFormat(transform) == TYPE_RGB_FLT);
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// Jakub Melka: It seems, that Adobe Acrobat Reader doesn't do the gamut remapping (whitepoint remapping).
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// so, we don't do that too.
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const cmsCIEXYZ* d50WhitePoint = cmsD50_XYZ();
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std::array<float, 3> xyzInputColor = { color[0] * float(d50WhitePoint->X), color[1] * float(d50WhitePoint->Y), color[2] * float(d50WhitePoint->Z)};
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const PDFColorComponentMatrix_3x3 adaptationMatrix = PDFChromaticAdaptationXYZ::createWhitepointChromaticAdaptation(getDefaultXYZWhitepoint(), whitePoint, m_settings.colorAdaptationXYZ);
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const PDFColor3 xyzInputColor = adaptationMatrix * color;
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std::array<float, 3> rgbOutputColor = { };
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cmsDoTransform(transform, xyzInputColor.data(), rgbOutputColor.data(), 1);
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return getColorFromOutputColor(rgbOutputColor);
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@ -1656,4 +1662,119 @@ PDFColor3 PDFCMS::getDefaultXYZWhitepoint()
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return PDFColor3{ PDFColorComponent(whitePoint->X), PDFColorComponent(whitePoint->Y), PDFColorComponent(whitePoint->Z) };
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}
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PDFColorComponentMatrix_3x3 PDFChromaticAdaptationXYZ::createWhitepointChromaticAdaptation(const PDFColor3& targetWhitePoint,
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const PDFColor3& sourceWhitePoint,
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PDFCMSSettings::ColorAdaptationXYZ method)
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{
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PDFColorComponentMatrix_3x3 matrix;
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matrix.makeIdentity();
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switch (method)
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{
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case pdf::PDFCMSSettings::ColorAdaptationXYZ::None:
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// No scaling performed, just return identity matrix
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break;
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case pdf::PDFCMSSettings::ColorAdaptationXYZ::XYZScaling:
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matrix.makeDiagonal(std::array{ targetWhitePoint[0] / sourceWhitePoint[0],
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targetWhitePoint[1] / sourceWhitePoint[1],
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targetWhitePoint[2] / sourceWhitePoint[2]
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});
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break;
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case pdf::PDFCMSSettings::ColorAdaptationXYZ::CAT97:
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{
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// CAT97 matrix, as defined in https://en.wikipedia.org/wiki/LMS_color_space
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constexpr PDFColorComponentMatrix_3x3 cat97Matrix(
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0.8562f, 0.3372f, -0.1934f,
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-0.8360f, 1.8327f, 0.0033f,
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0.0357f, -0.0469f, 1.0112f);
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// Inverse of CAT97 matrix (using wxMaxima to compute it)
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constexpr PDFColorComponentMatrix_3x3 inverseCat97Matrix(
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0.9873999149199271f, -0.1768250198556842f, 0.1894251049357571f,
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0.4504351090445315f, 0.464932897752711f, 0.08463199320275755f,
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-0.01396832510725165f, 0.027806572501434f, 0.9861617526058175f);
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PDFColor3 adaptedTargetWhitePoint = cat97Matrix * targetWhitePoint;
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PDFColor3 adaptedSourceWhitePoint = cat97Matrix * sourceWhitePoint;
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PDFColor3 gain = {
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adaptedTargetWhitePoint[0] / adaptedSourceWhitePoint[0],
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adaptedTargetWhitePoint[1] / adaptedSourceWhitePoint[1],
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adaptedTargetWhitePoint[2] / adaptedSourceWhitePoint[2]
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};
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PDFColorComponentMatrix_3x3 gainMatrix;
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gainMatrix.makeDiagonal(gain);
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matrix = inverseCat97Matrix * gainMatrix * cat97Matrix;
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break;
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}
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case pdf::PDFCMSSettings::ColorAdaptationXYZ::CAT02:
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{
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// CAT02 matrix, as defined in https://en.wikipedia.org/wiki/LMS_color_space
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constexpr PDFColorComponentMatrix_3x3 cat02Matrix(
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0.7328f, 0.4296f, -0.1624f,
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-0.7036f, 1.6975f, 0.0061f,
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0.0030f, 0.0136f, 0.9834f);
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// Inverse of CAT02 matrix (using wxMaxima to compute it)
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constexpr PDFColorComponentMatrix_3x3 inverseCat02Matrix(
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1.096123820835514f, -0.2788690002182872f, 0.182745179382773f,
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0.4543690419753592f, 0.4735331543074117f, 0.0720978037172291f,
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-0.009627608738429352f, -0.005698031216113419f, 1.015325639954543f);
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PDFColor3 adaptedTargetWhitePoint = cat02Matrix * targetWhitePoint;
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PDFColor3 adaptedSourceWhitePoint = cat02Matrix * sourceWhitePoint;
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PDFColor3 gain = {
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adaptedTargetWhitePoint[0] / adaptedSourceWhitePoint[0],
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adaptedTargetWhitePoint[1] / adaptedSourceWhitePoint[1],
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adaptedTargetWhitePoint[2] / adaptedSourceWhitePoint[2]
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};
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PDFColorComponentMatrix_3x3 gainMatrix;
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gainMatrix.makeDiagonal(gain);
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matrix = inverseCat02Matrix * gainMatrix * cat02Matrix;
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break;
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}
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case pdf::PDFCMSSettings::ColorAdaptationXYZ::Bradford:
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{
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// Bradford matrix, as defined in https://en.wikipedia.org/wiki/LMS_color_space
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constexpr PDFColorComponentMatrix_3x3 bradfordMatrix(
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0.8951f, 0.2264f, -0.1614f,
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-0.7502f, 1.7135f, 0.0367f,
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0.0389f, -0.0685f, 1.0296f);
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// Inverse of bradford matrix (using wxMaxima to compute it)
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constexpr PDFColorComponentMatrix_3x3 inverseBradfordMatrix(
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1.004360519274085f, -0.1262294327613208f, 0.1619428982062721f,
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0.4399123264001572f, 0.527481594455384f, 0.05015858096782513f,
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-0.008678739162151443f, 0.03986287311053728f, 0.9684695843590444f);
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PDFColor3 adaptedTargetWhitePoint = bradfordMatrix * targetWhitePoint;
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PDFColor3 adaptedSourceWhitePoint = bradfordMatrix * sourceWhitePoint;
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PDFColor3 gain = {
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adaptedTargetWhitePoint[0] / adaptedSourceWhitePoint[0],
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adaptedTargetWhitePoint[1] / adaptedSourceWhitePoint[1],
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adaptedTargetWhitePoint[2] / adaptedSourceWhitePoint[2]
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};
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PDFColorComponentMatrix_3x3 gainMatrix;
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gainMatrix.makeDiagonal(gain);
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matrix = inverseBradfordMatrix * gainMatrix * bradfordMatrix;
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break;
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}
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default:
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Q_ASSERT(false);
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break;
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}
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return matrix;
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}
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} // namespace pdf
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@ -419,6 +419,18 @@ private:
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mutable PDFCachedItem<PDFColorProfileIdentifiers> m_externalProfiles;
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};
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/// Class providing chromatic adaptation of whitepoints
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/// using various method.
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class PDFChromaticAdaptationXYZ
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{
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public:
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PDFChromaticAdaptationXYZ() = delete;
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static PDFColorComponentMatrix_3x3 createWhitepointChromaticAdaptation(const PDFColor3& targetWhitePoint,
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const PDFColor3& sourceWhitePoint,
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PDFCMSSettings::ColorAdaptationXYZ method);
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};
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} // namespace pdf
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#endif // PDFCMS_H
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@ -218,6 +218,10 @@ public:
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{
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return m_values[row * Cols + column];
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}
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inline void setValue(size_t row, size_t column, PDFColorComponent value)
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{
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m_values[row * Cols + column] = value;
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}
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void transpose()
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{
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@ -234,6 +238,33 @@ public:
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}
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}
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void makeIdentity()
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{
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Q_ASSERT(Rows == Cols);
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m_values = { };
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for (size_t row = 0; row < Rows; ++row)
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{
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const size_t index = row * Cols + row;
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m_values[index] = PDFColorComponent(1.0f);
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}
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}
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void makeDiagonal(auto diagonalItems)
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{
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Q_ASSERT(Rows == Cols);
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Q_ASSERT(diagonalItems.size() == Rows);
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m_values = { };
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for (size_t row = 0; row < Rows; ++row)
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{
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const size_t index = row * Cols + row;
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m_values[index] = diagonalItems[row];
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}
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}
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void multiplyByFactor(PDFColorComponent factor)
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{
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for (auto it = begin(); it != end(); ++it)
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@ -249,6 +280,29 @@ private:
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std::array<PDFColorComponent, Rows * Cols> m_values;
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};
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template<size_t i, size_t k, size_t j>
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static inline PDFColorComponentMatrix<i, j> operator*(const PDFColorComponentMatrix<i, k>& left, const PDFColorComponentMatrix<k, j>& right)
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{
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PDFColorComponentMatrix<i, j> result;
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for (size_t ci = 0; ci < i; ++ci)
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{
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for (size_t cj = 0; cj < j; ++cj)
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{
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PDFColorComponent value = 0.0f;
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for (size_t ck = 0; ck < k; ++ck)
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{
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value += left.getValue(ci, ck) * right.getValue(ck, cj);
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}
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result.setValue(ci, cj, value);
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}
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}
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return result;
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}
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using PDFColorComponentMatrix_3x3 = PDFColorComponentMatrix<3, 3>;
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/// Represents PDF's color space (abstract class). Contains functions for parsing
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