diff --git a/TODO b/TODO
index 4d03b12..c37dfb3 100644
--- a/TODO
+++ b/TODO
@@ -16,7 +16,6 @@ Technology Preview 2 :
 - Fix the distorted sun appearance.
 - Improve curve editor.
    => Add curve modes
-   => Improve curve rendering
    => Add axis labels and grid
    => Add logarithmic mode
 - Improve 3d explorer
diff --git a/gui_qt/inputcurve.cpp b/gui_qt/inputcurve.cpp
index cc38bb3..32f6150 100644
--- a/gui_qt/inputcurve.cpp
+++ b/gui_qt/inputcurve.cpp
@@ -27,7 +27,7 @@ public:
         QPainter painter(this);
         int width = this->width();
         int height = this->height();
-        double position, value;
+        double position, value, prev_value, next_value;
 
         painter.fillRect(rect(), QColor(255, 255, 255));
         for (int x = 0; x < width; x++)
@@ -35,6 +35,10 @@ public:
             painter.setPen(QColor(0, 0, 0));
             position = _xmin + (_xmax - _xmin) * (double)x / (double)(width - 1);
             value = (curveGetValue(_curve, position) - _ymin) * (_ymax - _ymin);
+            prev_value = curveGetValue(_curve, position - 1.0 / (double)(width - 1));
+            next_value = curveGetValue(_curve, position + 1.0 / (double)(width - 1));
+
+            painter.drawLine(x, height - 1 - (int)((value + (prev_value - value) / 2.0) * (double)(height - 1)), x, height - 1 - (int)((value + (next_value - value) / 2.0) * (double)(height - 1)));
             painter.drawPoint(x, height - 1 - (int)(value * (double)(height - 1)));
         }
     }
diff --git a/gui_qt/widgetcurveeditor.cpp b/gui_qt/widgetcurveeditor.cpp
index fdb6023..31cc085 100644
--- a/gui_qt/widgetcurveeditor.cpp
+++ b/gui_qt/widgetcurveeditor.cpp
@@ -41,7 +41,7 @@ void WidgetCurveEditor::paintEvent(QPaintEvent* event)
     int width, height;
     double dwidth, dheight;
     CurvePoint point;
-    double position, value;
+    double position, value, prev_value, next_value;
     
     width = this->width();
     height = this->height();
@@ -55,7 +55,12 @@ void WidgetCurveEditor::paintEvent(QPaintEvent* event)
     for (int x = 0; x < width; x++)
     {
         position = ((double)x) / dwidth;
+        
         value = curveGetValue(_curve, position);
+        prev_value = curveGetValue(_curve, position - 1.0 / dwidth);
+        next_value = curveGetValue(_curve, position + 1.0 / dwidth);
+        
+        painter.drawLine(x, height - 1 - (int)((value + (prev_value - value) / 2.0) * dheight), x, height - 1 - (int)((value + (next_value - value) / 2.0) * dheight));
         painter.drawPoint(x, height - 1 - (int)(value * dheight));
     }
     
diff --git a/i18n/paysages_fr.ts b/i18n/paysages_fr.ts
index 9c8ebea..e9ba179 100644
--- a/i18n/paysages_fr.ts
+++ b/i18n/paysages_fr.ts
@@ -850,7 +850,7 @@ Maintenir Ctrl : Plus rapide</translation>
 <context>
     <name>InputCurve</name>
     <message>
-        <location filename="../gui_qt/inputcurve.cpp" line="58"/>
+        <location filename="../gui_qt/inputcurve.cpp" line="62"/>
         <source>Edit</source>
         <translation type="unfinished">Editer</translation>
     </message>