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more tweaks to catmull-rom and histogram matching after the feedback by DrSlony

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This commit is contained in:
Alberto Griggio
2018-08-11 23:40:21 +02:00
parent 2bb27661a2
commit 0d7d1cfc8c
2 changed files with 24 additions and 19 deletions
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24
rtengine/histmatching.cc
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@@ -221,20 +221,26 @@ void mappingToCurve(const std::vector<int> &mapping, std::vector<double> &curve)
curve = { DCT_Linear }; // not enough points, fall back to linear
} else {
CubicSplineCurve c(curve);
curve.pop_back();
curve.pop_back();
double gap = coord(step);
while (1 - curve[curve.size()-2] > gap) {
double x = curve[curve.size()-2] + gap;
if (1 - x <= gap / 3) {
break;
}
double mid = coord(idx);
double x = 0.0;
constexpr double shgap = 0.075;
curve = { DCT_Spline };
while (mid - x > shgap / 2) {
curve.push_back(x);
curve.push_back(c.getVal(x));
x += shgap;
}
curve.push_back(mid);
curve.push_back(c.getVal(mid));
constexpr double hlgap = 0.2;
x = mid + hlgap;
while (1 - x > hlgap / 2) {
curve.push_back(x);
curve.push_back(c.getVal(x));
x += hlgap;
}
curve.push_back(1.0);
curve.push_back(1.0);
curve.insert(curve.begin(), DCT_Spline);
}
}