diff --git a/gui_qt/basepreview.cpp b/gui_qt/basepreview.cpp
index a856c5d..c366e77 100644
--- a/gui_qt/basepreview.cpp
+++ b/gui_qt/basepreview.cpp
@@ -23,38 +23,38 @@ public:
         _ystart = ystart;
         _xsize = xsize;
         _ysize = ysize;
-        
+
         _need_render = true;
         _rendering = false;
         _alive = true;
         _priority = xstart;
     }
-    
+
     inline BasePreview* preview()
     {
         return _preview;
     }
-    
+
     inline int priority()
     {
         return _priority;
     }
-    
+
     inline bool isOnFront()
     {
         return _preview->isVisible() && _preview->window()->isActiveWindow();
     }
-    
+
     bool isFrom(BasePreview* preview)
     {
         return _preview == preview;
     }
-    
+
     void interrupt()
     {
         _alive = false;
     }
-    
+
     void update()
     {
         _priority = _xstart;
@@ -65,15 +65,15 @@ public:
     {
         bool changed = false;
         int revision;
-        
+
         if (_rendering)
         {
             return false;
         }
-        
+
         _rendering = true;
         _alive = true;
-        
+
         if (_need_render)
         {
             if (!isOnFront())
@@ -82,9 +82,9 @@ public:
                 _rendering = false;
                 return false;
             }
-            
+
             _need_render = false;
-            
+
             QImage pixbuf = _preview->startChunkTransaction(_xstart, _ystart, _xsize, _ysize, &revision);
 
             for (int x = 0; x < _xsize; x++)
@@ -103,14 +103,14 @@ public:
                     {
                         QColor newcol = _preview->getPixelColor(_xstart + x, _ystart + y);
                         newcol.setAlpha(255);
-                        
+
                         pixbuf.setPixel(x, y, newcol.rgb());
-                        
+
                         changed = true;
                     }
                 }
             }
-            
+
             if (changed)
             {
                 _need_render = not _preview->commitChunkTransaction(&pixbuf, _xstart, _ystart, _xsize, _ysize, revision);
@@ -120,12 +120,12 @@ public:
                 _preview->rollbackChunkTransaction();
             }
         }
-        
+
         if (not _need_render)
         {
             _priority = -1;
         }
-        
+
         _rendering = false;
         return _need_render;
     }
@@ -219,12 +219,12 @@ void PreviewDrawingManager::removeChunks(BasePreview* preview)
             _chunks.remove(i);
             _updateQueue.removeAll(chunk);
             _lock.unlock();
-            
+
             removed++;
             i--;
         }
     }
-    
+
     logDebug(QString("[Previews] %1 chunks removed, %2 remaining").arg(removed).arg(_chunks.size()));
 }
 
@@ -317,7 +317,7 @@ void PreviewDrawingManager::performOneThreadJob()
             }
             _lock.unlock();
         }
-    }        
+    }
 }
 
 int PreviewDrawingManager::chunkCount()
@@ -353,11 +353,14 @@ QWidget(parent)
     _revision = 0;
     _transactions_count = 0;
     _redraw_requested = false;
-    
+
     _info = new QLabel(this);
     _info->setVisible(false);
     _info->setStyleSheet("QLabel { background-color: white; color: black; }");
 
+    _hdr_enabled = false;
+    _hdr_profile = colorProfileCreate();
+
     this->alive = true;
 
     QObject::connect(this, SIGNAL(contentChange()), this, SLOT(update()));
@@ -365,7 +368,7 @@ QWidget(parent)
     this->setMinimumSize(256, 256);
     this->setMaximumSize(256, 256);
     this->resize(256, 256);
-    
+
     startTimer(50);
 }
 
@@ -373,6 +376,8 @@ BasePreview::~BasePreview()
 {
     alive = false;
 
+    colorProfileDelete(_hdr_profile);
+
     _drawing_manager->removeChunks(this);
 
     delete _info;
@@ -380,6 +385,12 @@ BasePreview::~BasePreview()
     delete _lock_drawing;
 }
 
+void BasePreview::configHdrToneMapping(bool active)
+{
+    _hdr_enabled = active;
+    redraw();
+}
+
 void BasePreview::addOsd(QString name)
 {
     _osd.append(PreviewOsd::getInstance(name));
@@ -391,7 +402,7 @@ void BasePreview::savePack(PackStream* stream)
     packWriteDouble(stream, &this->xoffset);
     packWriteDouble(stream, &this->yoffset);
     packWriteDouble(stream, &this->scalingbase);
-    
+
     // TODO Save choices and toggles
 }
 
@@ -400,9 +411,9 @@ void BasePreview::loadPack(PackStream* stream)
     packReadDouble(stream, &this->xoffset);
     packReadDouble(stream, &this->yoffset);
     packReadDouble(stream, &this->scalingbase);
-    
+
     // TODO Save choices and toggles
-    
+
     updateScaling();
     emit contentChange();
 }
@@ -427,9 +438,9 @@ void BasePreview::updateData()
 {
 }
 
-QColor BasePreview::getColor(double, double)
+Color BasePreview::getColor(double, double)
 {
-    return QColor(0, 0, 0);
+    return COLOR_BLACK;
 }
 
 void BasePreview::configScaling(double min, double max, double step, double init, bool logarithmic)
@@ -473,9 +484,9 @@ void BasePreview::addChoice(const QString& key, const QString& title, const QStr
     choice.title = title;
     choice.items << choices;
     choice.current = init_value;
-    
+
     _choices.insert(key, choice);
-    
+
     choiceChangeEvent(key, init_value);
 }
 
@@ -488,9 +499,9 @@ void BasePreview::addToggle(const QString& key, const QString& text, bool init_v
     _ContextToggle toggle;
     toggle.title = text;
     toggle.value = init_value;
-    
+
     _toggles.insert(key, toggle);
-    
+
     toggleChangeEvent(key, init_value);
 }
 
@@ -507,24 +518,24 @@ void BasePreview::redraw()
 QImage BasePreview::startChunkTransaction(int x, int y, int w, int h, int* revision)
 {
     QImage result;
-    
+
     _lock_drawing->lock();
-    
+
     *revision = _revision;
     result = _pixbuf->copy(x, y, w, h);
     _transactions_count++;
-    
+
     _lock_drawing->unlock();
-    
+
     return result;
 }
 
 bool BasePreview::commitChunkTransaction(QImage* chunk, int x, int y, int w, int h, int revision)
 {
     bool result;
-    
+
     _lock_drawing->lock();
-    
+
     if (revision == _revision)
     {
         for (int ix = 0; ix < w; ix++)
@@ -541,26 +552,35 @@ bool BasePreview::commitChunkTransaction(QImage* chunk, int x, int y, int w, int
     {
         result = false;
     }
-    
+
     _transactions_count--;
-    
+
     _lock_drawing->unlock();
-    
+
     return result;
 }
 
 void BasePreview::rollbackChunkTransaction()
 {
     _lock_drawing->lock();
-    
+
     _transactions_count--;
-    
+
     _lock_drawing->unlock();
 }
 
 QColor BasePreview::getPixelColor(int x, int y)
 {
-    return getColor((double) (x - _width / 2) * scaling + xoffset, (double) (y - _height / 2) * scaling + yoffset);
+    Color col = getColor((double) (x - _width / 2) * scaling + xoffset, (double) (y - _height / 2) * scaling + yoffset);
+    if (_hdr_enabled)
+    {
+        col = colorProfileApply(_hdr_profile, col);
+    }
+    else
+    {
+        colorNormalize(&col);
+    }
+    return colorToQColor(col);
 }
 
 void BasePreview::timerEvent(QTimerEvent*)
@@ -647,7 +667,7 @@ void BasePreview::paintEvent(QPaintEvent*)
 {
     QPainter painter(this);
     painter.drawImage(0, 0, *this->_pixbuf);
-    
+
     QImage osd(_pixbuf->size(), _pixbuf->format());
     osd.fill(0x00000000);
     for (int i = 0; i < _osd.size(); i++)
@@ -705,10 +725,10 @@ void BasePreview::contextMenuEvent(QContextMenuEvent* event)
         {
             menu.addSeparator();
         }
-        
+
         iter1.next();
         menu.addAction(QString("   %1   ").arg(iter1.value().title))->setDisabled(true);
-        
+
         QStringList list = iter1.value().items;
         for (int i = 0; i < list.count(); i++)
         {
@@ -732,7 +752,7 @@ void BasePreview::contextMenuEvent(QContextMenuEvent* event)
         {
             menu.addSeparator();
         }
-        
+
         iter2.next();
 
         QAction* action = menu.addAction(iter2.value().title);
@@ -749,7 +769,7 @@ void BasePreview::contextMenuEvent(QContextMenuEvent* event)
     if (not menu.isEmpty())
     {
         connect(&menu, SIGNAL(triggered(QAction*)), this, SLOT(choiceSelected(QAction*)));
-        
+
         menu.exec(event->globalPos());
         event->accept();
     }
@@ -767,7 +787,7 @@ void BasePreview::mousePressEvent(QMouseEvent* event)
 void BasePreview::mouseMoveEvent(QMouseEvent* event)
 {
     int width, height;
-    
+
     width = this->width();
     height = this->height();
 
@@ -775,7 +795,7 @@ void BasePreview::mouseMoveEvent(QMouseEvent* event)
     {
         int dx, dy;
         int ndx, ndy;
-        
+
         dx = event->x() - mousex;
         dy = event->y() - mousey;
 
diff --git a/gui_qt/basepreview.h b/gui_qt/basepreview.h
index e5290d0..4dacad1 100644
--- a/gui_qt/basepreview.h
+++ b/gui_qt/basepreview.h
@@ -33,16 +33,16 @@ class BasePreview : public QWidget {
 public:
     BasePreview(QWidget* parent);
     ~BasePreview();
-    
+
     virtual void savePack(PackStream* stream);
     virtual void loadPack(PackStream* stream);
-    
+
     static void initDrawers();
     static void stopDrawers();
     static void reviveAll();
-    
+
     void redraw();
-    
+
     QImage startChunkTransaction(int x, int y, int w, int h, int* revision);
     bool commitChunkTransaction(QImage* chunk, int x, int y, int w, int h, int revision);
     void rollbackChunkTransaction();
@@ -51,8 +51,9 @@ public:
 
 protected:
     virtual void updateData();
-    virtual QColor getColor(double x, double y);
+    virtual Color getColor(double x, double y);
 
+    void configHdrToneMapping(bool active);
     void configScaling(double min, double max, double step, double init, bool logarithmic = true);
     void configScrolling(double xmin, double xmax, double xinit, double ymin, double ymax, double yinit);
 
@@ -89,12 +90,12 @@ private:
     QVector<PreviewOsd*> _osd;
     QHash<QString, _ContextChoice> _choices;
     QHash<QString, _ContextToggle> _toggles;
-    
+
     QLabel* _info;
 
     int _width;
     int _height;
-    
+
     int _revision;
     int _transactions_count;
     bool _redraw_requested;
@@ -105,6 +106,8 @@ private:
     double scalingbase;
 
     bool alive;
+    bool _hdr_enabled;
+    ColorProfile* _hdr_profile;
 
     double conf_scroll_xmin;
     double conf_scroll_xmax;
diff --git a/gui_qt/dialognoise.cpp b/gui_qt/dialognoise.cpp
index 1465369..5695341 100644
--- a/gui_qt/dialognoise.cpp
+++ b/gui_qt/dialognoise.cpp
@@ -1,5 +1,6 @@
 #include "dialognoise.h"
 
+#include <QWidget>
 #include <QVBoxLayout>
 #include <QImage>
 #include <QLabel>
@@ -9,7 +10,7 @@
 #include <QScrollArea>
 #include <QPushButton>
 #include <math.h>
-#include <qt4/QtGui/qwidget.h>
+#include "../lib_paysages/color.h"
 
 /**************** Previews ****************/
 class PreviewLevel:public BasePreview
@@ -34,15 +35,15 @@ protected:
     {
         noiseCopy(_noise_original, _noise_preview);
     }
-    QColor getColor(double x, double y)
+    Color getColor(double x, double y)
     {
         if ((_level >= 0) && (-y > noiseGet1DLevel(_noise_preview, _level, x)))
         {
-            return Qt::black;
+            return COLOR_WHITE;
         }
         else
         {
-            return Qt::white;
+            return COLOR_BLACK;
         }
     }
 private:
@@ -66,15 +67,15 @@ protected:
     {
         noiseCopy(_noise_original, _noise_preview);
     }
-    QColor getColor(double x, double y)
+    Color getColor(double x, double y)
     {
         if (-y > noiseGet1DTotal(_noise_preview, x))
         {
-            return Qt::black;
+            return COLOR_WHITE;
         }
         else
         {
-            return Qt::white;
+            return COLOR_BLACK;
         }
     }
 private:
diff --git a/gui_qt/formatmosphere.cpp b/gui_qt/formatmosphere.cpp
index a8abca3..fbd149b 100644
--- a/gui_qt/formatmosphere.cpp
+++ b/gui_qt/formatmosphere.cpp
@@ -21,12 +21,13 @@ public:
     {
         _renderer = atmosphereCreatePreviewRenderer();
 
+        configHdrToneMapping(true);
         configScaling(0.5, 5.0, 0.5, 2.5);
     }
 protected:
-    QColor getColor(double x, double y)
+    Color getColor(double x, double y)
     {
-        return colorToQColor(atmosphereGetPreview(&_renderer, x, -y, M_PI_2));
+        return atmosphereGetPreview(&_renderer, x, -y, M_PI_2);
     }
     void updateData()
     {
@@ -44,12 +45,13 @@ public:
     {
         _renderer = atmosphereCreatePreviewRenderer();
 
+        configHdrToneMapping(true);
         configScaling(0.5, 5.0, 0.5, 2.5);
     }
 protected:
-    QColor getColor(double x, double y)
+    Color getColor(double x, double y)
     {
-        return colorToQColor(atmosphereGetPreview(&_renderer, x, -y, -M_PI_2));
+        return atmosphereGetPreview(&_renderer, x, -y, -M_PI_2);
     }
     void updateData()
     {
diff --git a/gui_qt/formclouds.cpp b/gui_qt/formclouds.cpp
index 760f9c7..6c3f9aa 100644
--- a/gui_qt/formclouds.cpp
+++ b/gui_qt/formclouds.cpp
@@ -27,10 +27,9 @@ public:
         cloudsLayerDeleteDefinition(_preview_layer);
     }
 protected:
-    QColor getColor(double x, double y)
+    Color getColor(double x, double y)
     {
         Vector3 eye, look;
-        Color color_layer;
 
         eye.x = 0.0;
         eye.y = scaling;
@@ -40,8 +39,7 @@ protected:
         look.z = 1.0;
         look = v3Normalize(look);
 
-        color_layer = cloudsApplyLayer(_preview_layer, COLOR_BLUE, &_renderer, eye, v3Add(eye, v3Scale(look, 1000.0)));
-        return colorToQColor(color_layer);
+        return cloudsApplyLayer(_preview_layer, COLOR_BLUE, &_renderer, eye, v3Add(eye, v3Scale(look, 1000.0)));
     }
     void updateData()
     {
@@ -90,10 +88,9 @@ public:
         configScaling(0.5, 2.0, 0.1, 2.0);
     }
 protected:
-    QColor getColor(double x, double y)
+    Color getColor(double x, double y)
     {
         Vector3 start, end;
-        Color color_layer;
 
         start.x = x * _preview_layer->thickness * 0.5;
         start.y = -y * _preview_layer->thickness * 0.5;
@@ -103,8 +100,7 @@ protected:
         end.y = -y * _preview_layer->thickness * 0.5;
         end.z = -_preview_layer->thickness * 0.5;
 
-        color_layer = cloudsApplyLayer(_preview_layer, COLOR_BLUE, &_renderer, start, end);
-        return colorToQColor(color_layer);
+        return cloudsApplyLayer(_preview_layer, COLOR_BLUE, &_renderer, start, end);
     }
     void updateData()
     {
diff --git a/gui_qt/formrender.cpp b/gui_qt/formrender.cpp
index 756d3d9..9cc13fb 100644
--- a/gui_qt/formrender.cpp
+++ b/gui_qt/formrender.cpp
@@ -39,7 +39,7 @@ public:
         configScrolling(-1000.0, 1000.0, 0.0, -1000.0, 1000.0, 0.0);
     }
 protected:
-    QColor getColor(double x, double y)
+    Color getColor(double x, double y)
     {
         Vector3 down = {0.0, -1.0, 0.0};
         Vector3 location;
@@ -50,14 +50,14 @@ protected:
             location.x = x;
             location.y = _water.height;
             location.z = y;
-            return colorToQColor(waterGetColor(&_water, &_renderer, location, down));
+            return waterGetColor(&_water, &_renderer, location, down);
         }
         else
         {
             location.x = x;
             location.y = height;
             location.z = y;
-            return colorToQColor(_renderer.terrain->getFinalColor(&_renderer, location, scaling));
+            return _renderer.terrain->getFinalColor(&_renderer, location, scaling);
         }
     }
     void updateData()
diff --git a/gui_qt/formterrain.cpp b/gui_qt/formterrain.cpp
index 493536b..b3844e5 100644
--- a/gui_qt/formterrain.cpp
+++ b/gui_qt/formterrain.cpp
@@ -22,9 +22,9 @@ public:
         configScrolling(-1000.0, 1000.0, 0.0, -1000.0, 1000.0, 0.0);
     }
 protected:
-    QColor getColor(double x, double y)
+    Color getColor(double x, double y)
     {
-        return colorToQColor(terrainGetPreviewColor(&_renderer, x, -y, scaling));
+        return terrainGetPreviewColor(&_renderer, x, -y, scaling);
     }
     void updateData()
     {
diff --git a/gui_qt/formtextures.cpp b/gui_qt/formtextures.cpp
index 8b511a7..18e27ff 100644
--- a/gui_qt/formtextures.cpp
+++ b/gui_qt/formtextures.cpp
@@ -35,15 +35,15 @@ public:
         texturesLayerDeleteDefinition(_preview_layer);
     }
 protected:
-    QColor getColor(double x, double y)
+    Color getColor(double x, double y)
     {
         Vector3 location;
-        double coverage;
+        Color result;
         location.x = x;
         location.y = _renderer.terrain->getHeight(&_renderer, x, y, 1);
         location.z = y;
-        coverage = texturesGetLayerCoverage(_preview_layer, &_renderer, location, this->scaling);
-        return QColor::fromRgbF(coverage, coverage, coverage, 1.0);
+        result.r = result.g = result.b = texturesGetLayerCoverage(_preview_layer, &_renderer, location, this->scaling);
+        return result;
     }
     void updateData()
     {
@@ -99,13 +99,13 @@ public:
         texturesLayerDeleteDefinition(_preview_layer);
     }
 protected:
-    QColor getColor(double x, double y)
+    Color getColor(double x, double y)
     {
         Vector3 location;
         location.x = x;
         location.y = 0.0;
         location.z = y;
-        return colorToQColor(texturesGetLayerColor(_preview_layer, &_renderer, location, this->scaling));
+        return texturesGetLayerColor(_preview_layer, &_renderer, location, this->scaling);
     }
     void updateData()
     {
diff --git a/gui_qt/formwater.cpp b/gui_qt/formwater.cpp
index d4fbf8d..9a40b6d 100644
--- a/gui_qt/formwater.cpp
+++ b/gui_qt/formwater.cpp
@@ -31,14 +31,14 @@ public:
         configScrolling(-1000.0, 1000.0, 0.0, -1000.0, 1000.0, 0.0);
     }
 protected:
-    QColor getColor(double x, double y)
+    Color getColor(double x, double y)
     {
         double height;
 
         height = _renderer.terrain->getHeight(&_renderer, x, -y, 1);
         if (height > _definition.height)
         {
-            return colorToQColor(terrainGetPreviewColor(&_renderer, x, -y, scaling));
+            return terrainGetPreviewColor(&_renderer, x, -y, scaling);
         }
         else
         {
@@ -61,7 +61,7 @@ protected:
                 colorMask(&base, &mask);
             }
 
-            return colorToQColor(base);
+            return base;
         }
     }
     void updateData()
@@ -127,7 +127,7 @@ public:
     }
     int _background;
 protected:
-    QColor getColor(double x, double y)
+    Color getColor(double x, double y)
     {
         Vector3 eye, look, location;
 
@@ -141,7 +141,7 @@ protected:
 
         if (look.y > -0.0001)
         {
-            return colorToQColor(_rayWalking(&_renderer, eye, look, 0, 0, 0, 0).hit_color);
+            return _rayWalking(&_renderer, eye, look, 0, 0, 0, 0).hit_color;
         }
 
         location.x = eye.x - look.x * eye.y / look.y;
@@ -150,10 +150,10 @@ protected:
 
         if (location.z > 0.0)
         {
-            return colorToQColor(_rayWalking(&_renderer, eye, look, 0, 0, 0, 0).hit_color);
+            return _rayWalking(&_renderer, eye, look, 0, 0, 0, 0).hit_color;
         }
 
-        return colorToQColor(waterGetColor(&_water, &_renderer, location, look));
+        return waterGetColor(&_water, &_renderer, location, look);
     }
     void updateData()
     {
@@ -183,7 +183,7 @@ private:
     LightingDefinition _lighting;
     bool _lighting_enabled;
 
-    static RayCastingResult _rayWalking(Renderer* renderer, Vector3 location, Vector3 direction, int terrain, int water, int sky, int clouds)
+    static RayCastingResult _rayWalking(Renderer* renderer, Vector3 location, Vector3 direction, int, int, int, int)
     {
         RayCastingResult result;
         PreviewWaterColor* preview = (PreviewWaterColor*)renderer->customData[2];
diff --git a/gui_qt/inputnoise.cpp b/gui_qt/inputnoise.cpp
index 728e1be..0c1c4c0 100644
--- a/gui_qt/inputnoise.cpp
+++ b/gui_qt/inputnoise.cpp
@@ -16,7 +16,7 @@ public:
     {
     }
 
-    void paintEvent(QPaintEvent* event)
+    void paintEvent(QPaintEvent*)
     {
         if (!noise)
         {
diff --git a/gui_qt/previewcolorgradation.cpp b/gui_qt/previewcolorgradation.cpp
index 1675be7..dd368b4 100644
--- a/gui_qt/previewcolorgradation.cpp
+++ b/gui_qt/previewcolorgradation.cpp
@@ -18,8 +18,8 @@ PreviewColorGradation::PreviewColorGradation(QWidget* parent, ColorGradation* gr
     this->gradation = gradation;
     this->band = band;
 }
-    
-void PreviewColorGradation::paintEvent(QPaintEvent* event)
+
+void PreviewColorGradation::paintEvent(QPaintEvent*)
 {
     Curve* curve;
 
@@ -67,7 +67,7 @@ void PreviewColorGradation::paintEvent(QPaintEvent* event)
     curveDelete(curve);
 }
 
-void PreviewColorGradation::mouseReleaseEvent(QMouseEvent* event)
+void PreviewColorGradation::mouseReleaseEvent(QMouseEvent*)
 {
     emit clicked();
 }
diff --git a/gui_qt/previewmaterial.cpp b/gui_qt/previewmaterial.cpp
index f85d0fc..0811cce 100644
--- a/gui_qt/previewmaterial.cpp
+++ b/gui_qt/previewmaterial.cpp
@@ -38,7 +38,7 @@ SmallMaterialPreview::~SmallMaterialPreview()
     rendererDelete(&_renderer);
 }
 
-QColor SmallMaterialPreview::getColor(double x, double y)
+Color SmallMaterialPreview::getColor(double x, double y)
 {
     double dist = sqrt(x * x + y * y);
     Vector3 point;
@@ -46,7 +46,7 @@ QColor SmallMaterialPreview::getColor(double x, double y)
 
     if (dist >= 1.0)
     {
-        return colorToQColor(COLOR_TRANSPARENT);
+        return COLOR_TRANSPARENT;
     }
     else
     {
@@ -67,17 +67,17 @@ QColor SmallMaterialPreview::getColor(double x, double y)
         {
             color.a = (1.0 - dist) / 0.05;
         }
-        return colorToQColor(color);
+        return color;
     }
 }
 
-void SmallMaterialPreview::paintEvent(QPaintEvent* event)
+void SmallMaterialPreview::paintEvent(QPaintEvent*)
 {
     QPainter painter(this);
     int width = this->width();
     int height = this->height();
     double factor, dx, dy;
-    
+
     if (width > height)
     {
         factor = 2.0 / (double)height;
@@ -93,7 +93,7 @@ void SmallMaterialPreview::paintEvent(QPaintEvent* event)
     {
         for (int y = 0; y < height; y++)
         {
-            painter.setPen(getColor((double)x * factor - dx, (double)y * factor - dy));
+            painter.setPen(colorToQColor(getColor((double)x * factor - dx, (double)y * factor - dy)));
             painter.drawPoint(x, y);
         }
     }
@@ -105,7 +105,7 @@ PreviewMaterial::PreviewMaterial(QWidget* parent, SurfaceMaterial* material) : B
 {
     _small = new SmallMaterialPreview(this, material);
     _small->hide();
-    
+
     configScaling(0.05, 2.0, 0.05, 2.0);
 }
 
@@ -114,7 +114,7 @@ PreviewMaterial::~PreviewMaterial()
     delete _small;
 }
 
-QColor PreviewMaterial::getColor(double x, double y)
+Color PreviewMaterial::getColor(double x, double y)
 {
     return _small->getColor(x, y);
 }
diff --git a/gui_qt/previewmaterial.h b/gui_qt/previewmaterial.h
index e4dadda..5cc711e 100644
--- a/gui_qt/previewmaterial.h
+++ b/gui_qt/previewmaterial.h
@@ -11,12 +11,12 @@ class SmallMaterialPreview:public QWidget
 public:
     SmallMaterialPreview(QWidget* parent, SurfaceMaterial* material);
     ~SmallMaterialPreview();
-    
-    QColor getColor(double x, double y);
-    
+
+    Color getColor(double x, double y);
+
 protected:
     virtual void paintEvent(QPaintEvent* event);
-    
+
 private:
     SurfaceMaterial* _material;
     LightingDefinition _lighting;
@@ -26,13 +26,13 @@ private:
 class PreviewMaterial:public BasePreview
 {
     Q_OBJECT
-    
+
 public:
     PreviewMaterial(QWidget* parent, SurfaceMaterial* material);
     ~PreviewMaterial();
-    
+
 protected:
-    virtual QColor getColor(double x, double y);
+    virtual Color getColor(double x, double y);
 
 private:
     SmallMaterialPreview* _small;
diff --git a/gui_qt/widgetcurveeditor.cpp b/gui_qt/widgetcurveeditor.cpp
index fb69c68..f4a55a3 100644
--- a/gui_qt/widgetcurveeditor.cpp
+++ b/gui_qt/widgetcurveeditor.cpp
@@ -10,12 +10,12 @@ WidgetCurveEditor::WidgetCurveEditor(QWidget *parent, double xmin, double xmax,
     _curve = curveCreate();
     _dragged = -1;
     _pen = QColor(0, 0, 0);
-    
+
     _xmin = xmin;
     _xmax = xmax;
     _ymin = ymin;
     _ymax = ymax;
-    
+
     setMinimumSize(300, 300);
 }
 
@@ -47,22 +47,22 @@ void WidgetCurveEditor::setPenColor(QColor color)
     update();
 }
 
-void WidgetCurveEditor::paintEvent(QPaintEvent* event)
+void WidgetCurveEditor::paintEvent(QPaintEvent*)
 {
     int i, n;
     int width, height;
     double dwidth, dheight;
     CurvePoint point;
     double position, value, prev_value, next_value;
-    
+
     width = this->width();
     height = this->height();
     dheight = (double)(height - 1);
     dwidth = (double)(width - 1);
-    
+
     QPainter painter(this);
     painter.fillRect(rect(), Qt::white);
-    
+
     // Draw grid
     painter.setPen(QPen(Qt::lightGray));
     for (int x = 0; x <= 10; x++)
@@ -72,7 +72,7 @@ void WidgetCurveEditor::paintEvent(QPaintEvent* event)
         vx = (x == 10) ? height - 1 : x * height / 10;
         painter.drawLine(0, vx, width - 1, vx);
     }
-    
+
     // Draw labels
     painter.setPen(QColor(50, 50, 50));
     if (not _xlabel.isEmpty())
@@ -87,21 +87,21 @@ void WidgetCurveEditor::paintEvent(QPaintEvent* event)
         painter.translate(height, 0.0);
         painter.rotate(90.0);
     }
-    
+
     // Draw curve path
     painter.setPen(_pen);
     for (int x = 0; x < width; x++)
     {
         position = ((double)x / dwidth) * (_xmax - _xmin) + _xmin;
-        
+
         value = (curveGetValue(_curve, position) - _ymin) / (_ymax - _ymin);
         prev_value = curveGetValue(_curve, position - (_xmax - _xmin) / dwidth);
         next_value = curveGetValue(_curve, position + (_xmax - _xmin) / 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));
     }
-    
+
     // Draw handles
     n = curveGetPointCount(_curve);
     painter.setRenderHints(QPainter::Antialiasing | QPainter::HighQualityAntialiasing, true);
@@ -118,37 +118,37 @@ void WidgetCurveEditor::mousePressEvent(QMouseEvent* event)
     {
         _dragged = getPointAt(event->x(), event->y());
     }
-    
+
     event->accept();
 }
 
 void WidgetCurveEditor::mouseMoveEvent(QMouseEvent* event)
 {
     CurvePoint point;
-    
+
     if (_dragged >= 0 && (event->buttons() & Qt::LeftButton))
     {
         screenToCurve(event->x(), event->y(), &point.position, &point.value);
-        
+
         point.position = (point.position < _xmin) ? _xmin : point.position;
         point.position = (point.position > _xmax) ? _xmax : point.position;
         point.value = (point.value < _ymin) ? _ymin : point.value;
         point.value = (point.value > _ymax) ? _ymax : point.value;
-        
+
         curveSetPoint(_curve, _dragged, &point);
 
         update();
-        
+
         emit liveChanged();
     }
-    
+
     event->accept();
 }
 
 void WidgetCurveEditor::mouseReleaseEvent(QMouseEvent* event)
 {
     int clicked;
-    
+
     if (event->button() == Qt::RightButton)
     {
         clicked = getPointAt(event->x(), event->y());
@@ -165,14 +165,14 @@ void WidgetCurveEditor::mouseReleaseEvent(QMouseEvent* event)
         curveValidate(_curve);
         update();
     }
-    
+
     event->accept();
 }
 
 void WidgetCurveEditor::mouseDoubleClickEvent(QMouseEvent* event)
 {
     CurvePoint point;
-    
+
     if (event->button() == Qt::LeftButton && _dragged < 0)
     {
         if (getPointAt(event->x(), event->y()) < 0)
@@ -205,7 +205,7 @@ int WidgetCurveEditor::getPointAt(int x, int y)
     double distance, ndistance;
     CurvePoint point;
     int dx, dy;
-    
+
     n = curveGetPointCount(_curve);
     if (n < 1)
     {
@@ -226,7 +226,7 @@ int WidgetCurveEditor::getPointAt(int x, int y)
             nearest = i;
         }
     }
-    
+
     if (nearest >= 0 && distance < 5.0)
     {
         return nearest;
diff --git a/gui_qt/widgetexplorer.cpp b/gui_qt/widgetexplorer.cpp
index ecbb7f9..6d34eb4 100644
--- a/gui_qt/widgetexplorer.cpp
+++ b/gui_qt/widgetexplorer.cpp
@@ -339,7 +339,7 @@ void WidgetExplorer::wheelEvent(QWheelEvent* event)
     event->accept();
 }
 
-void WidgetExplorer::timerEvent(QTimerEvent *event)
+void WidgetExplorer::timerEvent(QTimerEvent*)
 {
     if (_updated)
     {
diff --git a/lib_paysages/atmosphere/bruneton.c b/lib_paysages/atmosphere/bruneton.c
index 074f900..c5e82c1 100644
--- a/lib_paysages/atmosphere/bruneton.c
+++ b/lib_paysages/atmosphere/bruneton.c
@@ -212,7 +212,7 @@ static double _opticalDepth(double H, double r, double mu, double d)
     double ayq = ay * ay;
     double x = ays > axs ? exp(axq) : 0.0;
     double yx = axs / (2.3193 * fabs(ax) + sqrt(1.52 * axq + 4.0));
-    double yy = ays / (2.3193 * fabs(ay) + sqrt(1.52 * ayq + 4.0)) *  exp(-d / H * (d / (2.0 * r) + mu));
+    double yy = ays / (2.3193 * fabs(ay) + sqrt(1.52 * ayq + 4.0)) * exp(-d / H * (d / (2.0 * r) + mu));
     return sqrt((6.2831 * H) * r) * exp((Rg - r) / H) * (x + yx - yy);
 }
 
@@ -286,11 +286,10 @@ static double _limit(double r, double mu)
 static Vector3 _analyticTransmittance(double r, double mu, double d)
 {
     Vector3 result;
-    double opt = _opticalDepth(HR, r, mu, d);
 
-    result.x = exp(-betaR.r * opt) - betaMEx.x * opt;
-    result.y = exp(-betaR.g * opt) - betaMEx.y * opt;
-    result.z = exp(-betaR.b * opt) - betaMEx.z * opt;
+    result.x = exp(-betaR.r * _opticalDepth(HR, r, mu, d) - betaMEx.x * _opticalDepth(HM, r, mu, d));
+    result.y = exp(-betaR.g * _opticalDepth(HR, r, mu, d) - betaMEx.y * _opticalDepth(HM, r, mu, d));
+    result.z = exp(-betaR.b * _opticalDepth(HR, r, mu, d) - betaMEx.z * _opticalDepth(HM, r, mu, d));
 
     return result;
 }
diff --git a/lib_paysages/atmosphere/preview.c b/lib_paysages/atmosphere/preview.c
index 1b09359..bad529f 100644
--- a/lib_paysages/atmosphere/preview.c
+++ b/lib_paysages/atmosphere/preview.c
@@ -135,6 +135,11 @@ Color atmosphereGetPreview(Renderer* renderer, double x, double y, double headin
         normal = m4Transform(rotation, normal);
         hit = m4Transform(rotation, hit);
 
+        if (y == 0.0)
+        {
+            y = 0.0;
+        }
+
         renderer->getLightStatus(renderer, &light, hit);
         color = renderer->applyLightStatus(renderer, &light, hit, normal, MOUNT_MATERIAL);
 
diff --git a/lib_paysages/tools/memory.c b/lib_paysages/tools/memory.c
index 4da8dd7..874f772 100644
--- a/lib_paysages/tools/memory.c
+++ b/lib_paysages/tools/memory.c
@@ -1,6 +1,6 @@
 #include "memory.h"
 
-#include <assert.h>
+#include <stdlib.h>
 
 void* memory2dRealloc(void* data, int datasize, int oldxsize, int oldysize, int newxsize, int newysize, int xoffset, int yoffset)
 {