diff --git a/imageviewer-qt4.cpp b/imageviewer-qt4.cpp
index b94d70b..0e7b023 100644
--- a/imageviewer-qt4.cpp
+++ b/imageviewer-qt4.cpp
@@ -73,6 +73,31 @@ void ImageViewer::initializeImage() {
   analyzeImage();
 }
 
+/**
+ * In case it is needed, convert the loaded image into grayscale.
+ * @brief ImageViewer::convertToMonochrome
+ */
+void ImageViewer::convertToMonochrome() {
+  if(image!=NULL) {
+    logFile << "Converting image to monochrome...";
+    renewLogging();
+    for(int x=0; x<image->width(); x++) {
+      for(int y=0; y<image->height(); y++) {
+        int r,g,b;
+        QColor color = QColor::fromRgb(image->pixel(x, y));
+        color.getRgb(&r,&g,&b);
+        int intensity = (int)(0.299*r+0.587*g+0.114*b);
+        color = QColor::fromRgb(intensity, intensity, intensity);
+        image->setPixel(x, y, color.rgba());
+        original_image->setPixel(x, y, color.rgba());
+      }
+    }
+    updateImageDisplay();
+    logFile << "done." << std::endl;
+    renewLogging();
+  }
+}
+
 
 /**
  * Draws a simple, black line.
@@ -195,7 +220,7 @@ void ImageViewer::analyzeImage() {
     renewLogging();
 
     QString result = QString("Intensity: Average: %1, Variance: %2").arg(getAverageIntensity()).arg(getIntensityVariance());
-    task_tab2_stats->setText(result);
+    stats->setText(result);
 
     updateHistogramm();
   }
@@ -324,21 +349,25 @@ void ImageViewer::generateControlPanels() {
   task_tab1 = new QVBoxLayout();
   task_tab_widget1->setLayout(task_tab1);
 
-  task_tab1_button1 = new QPushButton();
-  task_tab1_button1->setText("Draw a black line");
-  QObject::connect(task_tab1_button1, SIGNAL(clicked()), this, SLOT (drawBlackLine()));
+  monochrome = new QPushButton();
+  monochrome->setText("Convert to monochrome");
+  QObject::connect(monochrome, SIGNAL(clicked()), this, SLOT (convertToMonochrome()));
+  
+  draw_black_line = new QPushButton();
+  draw_black_line->setText("Draw a black line");
+  QObject::connect(draw_black_line, SIGNAL(clicked()), this, SLOT (drawBlackLine()));
 
-  task_tab1_button2 = new QPushButton();
-  task_tab1_button2->setText("Draw a rainbow cross");
-  QObject::connect(task_tab1_button2, SIGNAL(clicked()), this, SLOT (drawRainbowCross()));
+  draw_rainbow_cross = new QPushButton();
+  draw_rainbow_cross->setText("Draw a rainbow cross");
+  QObject::connect(draw_rainbow_cross, SIGNAL(clicked()), this, SLOT (drawRainbowCross()));
 
-  task_tab1_button3 = new QPushButton();
-  task_tab1_button3->setText("Start the neverending acid trip!");
-  QObject::connect(task_tab1_button3, SIGNAL(clicked()), this, SLOT (acidTrippin()));
+  acid_trip = new QPushButton();
+  acid_trip->setText("Start the neverending acid trip!");
+  QObject::connect(acid_trip, SIGNAL(clicked()), this, SLOT (acidTrippin()));
 
-  task_tab1_button4 = new QPushButton();
-  task_tab1_button4->setText("Draw a diagonal cross");
-  QObject::connect(task_tab1_button4, SIGNAL(clicked()), this, SLOT (drawDiagonalCross()));
+  diagonal_cross = new QPushButton();
+  diagonal_cross->setText("Draw a diagonal cross");
+  QObject::connect(diagonal_cross, SIGNAL(clicked()), this, SLOT (drawDiagonalCross()));
 
   line_slider = new QSlider(Qt::Horizontal);
   line_slider->setMinimum(1);
@@ -346,11 +375,12 @@ void ImageViewer::generateControlPanels() {
   line_slider->setValue(3);
   //QObject::connect(lineSlider, SIGNAL(valueChanged(int)), this, SLOT (drawRainbowCross()));
  
+  task_tab1->addWidget(monochrome);
   task_tab1->addWidget(new QLabel("Let's draw something!"));
-  task_tab1->addWidget(task_tab1_button1);
-  task_tab1->addWidget(task_tab1_button2);
-  task_tab1->addWidget(task_tab1_button3);
-  task_tab1->addWidget(task_tab1_button4);
+  task_tab1->addWidget(draw_black_line);
+  task_tab1->addWidget(draw_rainbow_cross);
+  task_tab1->addWidget(acid_trip);
+  task_tab1->addWidget(diagonal_cross);
   task_tab1->addWidget(new QLabel("This will not stop unless process is killed."));
   task_tab1->addWidget(line_slider);
   task_tab1->addWidget(new QLabel("Sets the width of the cross."));
@@ -368,9 +398,13 @@ void ImageViewer::generateControlPanels() {
   histogramm_label->setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Expanding);
   histogramm_label->setScaledContents(false);
 
-  task_tab2_stats = new QLabel();
-  task_tab2_stats->setText("Intensity will be shown here.");
+  stats = new QLabel();
+  stats->setText("Intensity will be shown here.");
   
+  analyze_image = new QPushButton();
+  analyze_image->setText("Analyze image");
+  QObject::connect(analyze_image, SIGNAL(clicked()), this, SLOT(analyzeImage()));
+
   brightness_slider = new QSlider(Qt::Horizontal);
   brightness_slider->setMinimum(0);
   brightness_slider->setMaximum(510);
@@ -383,9 +417,10 @@ void ImageViewer::generateControlPanels() {
   contrast_slider->setValue(255);
   QObject::connect(contrast_slider, SIGNAL(valueChanged(int)), this, SLOT (adjustContrast(int)));
 
-  task_tab2->addWidget(task_tab2_stats);
+  task_tab2->addWidget(stats);
   task_tab2->addWidget(new QLabel("Histogramm"));
   task_tab2->addWidget(histogramm_label);
+  task_tab2->addWidget(analyze_image);
   task_tab2->addWidget(new QLabel("Brightness"));
   task_tab2->addWidget(brightness_slider);
   task_tab2->addWidget(new QLabel("Contrast"));
diff --git a/imageviewer-qt4.h b/imageviewer-qt4.h
index 7075eb5..ce7b639 100644
--- a/imageviewer-qt4.h
+++ b/imageviewer-qt4.h
@@ -72,10 +72,12 @@ class ImageViewer : public QMainWindow {
     QWidget* task_tab_widget1;
     QVBoxLayout* task_tab1;
 
-    QPushButton* task_tab1_button1;
-    QPushButton* task_tab1_button2;
-    QPushButton* task_tab1_button3;
-    QPushButton* task_tab1_button4;
+    QPushButton* draw_black_line;
+    QPushButton* draw_rainbow_cross;
+    QPushButton* acid_trip;
+    QPushButton* diagonal_cross;
+    QPushButton* monochrome;
+
 
     QSlider* line_slider;
 
@@ -83,8 +85,9 @@ class ImageViewer : public QMainWindow {
     QWidget* task_tab_widget2;
     QVBoxLayout* task_tab2;
 
-    QLabel* task_tab2_stats;
+    QLabel* stats;
     QLabel* histogramm_label;
+    QPushButton* analyze_image;
     
     QSlider* brightness_slider;
     QSlider* contrast_slider;
@@ -109,6 +112,7 @@ class ImageViewer : public QMainWindow {
     void updateHistogramm();
     void adjustBrightness(int b);
     void adjustContrast(int c);
+    void convertToMonochrome();
 
     void open();
     void print();