improve generated curve in histogram matching on underexposed pictures

2018-01-30 10:06:57 +01:00
parent 8af91ce74c
commit 71a3af0c86
1 changed files with 9 additions and 0 deletions
--- a/rtengine/histmatching.cc
+++ b/rtengine/histmatching.cc
@@ -120,6 +120,15 @@ void mappingToCurve(const std::vector<int> &mapping, std::vector<double> &curve)
        curve.pop_back();
        curve.pop_back();
    }
+    // remove the plateau at the end (if any)
+    size_t j = curve.size() / 2;
+    for (; j > 1; --j) {
+        if (std::abs(curve[2*(j-1)-1] - curve.back()) > 0.01) {
+            break;
+        }
+    }
+    curve.resize(2*j);
+        
    curve.push_back(1.0);
    curve.push_back(1.0);