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Issue 2837: added 'Perceptual' tone curve

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This commit is contained in:
torger
2015-07-26 20:37:44 +02:00
parent c5546d2120
commit 6bb0d15ff0
9 changed files with 526 additions and 5 deletions
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30
rtengine/curves.h
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@@ -638,6 +638,36 @@ class LuminanceToneCurve : public ToneCurve {
void Apply(float& r, float& g, float& b) const;
};
class PerceptualToneCurveState {
public:
bool isProphoto;
float Working2Prophoto[3][3];
float Prophoto2Working[3][3];
float cmul_contrast;
};
// Tone curve whose purpose is to keep the color appearance constant, that is the curve changes contrast
// but colors appears to have the same hue and saturation as before. As contrast and saturation is tightly
// coupled in human vision saturation is modulated based on the curve's contrast, and that way the appearance
// can be kept perceptually constant (within limits).
class PerceptualToneCurve : public ToneCurve {
private:
static cmsHANDLE *h02;
static cmsContext *c02;
static float cf_range[2];
static float cf[1000];
static void cubic_spline(const float x[], const float y[], const int len, const float out_x[], float out_y[], const int out_len);
static float find_minimum_interval_halving(float (*func)(float x, void *arg), void *arg, float a, float b, float tol, int nmax);
static float find_tc_slope_fun(float k, void *arg);
static float get_curve_val(float x, float range[2], float lut[], size_t lut_size);
float calculateToneCurveContrastValue() const;
public:
static void init();
static void cleanup();
void initApplyState(PerceptualToneCurveState & state, Glib::ustring workingSpace) const;
void Apply(float& r, float& g, float& b, PerceptualToneCurveState & state) const;
};
class WeightedStdToneCurvebw : public ToneCurve {
private:
float Triangle(float refX, float refY, float X2) const;