diff --git a/src/main_window.cpp b/src/main_window.cpp
index e35e1dc..d21f22a 100755
--- a/src/main_window.cpp
+++ b/src/main_window.cpp
@@ -136,16 +136,19 @@ void AC_MainWindow::createControls() {
     btn_remove = new QPushButton(tr("Remove"), this);
     btn_moveup = new QPushButton(tr("Move Up"), this);
     btn_movedown = new QPushButton(tr("Move Down"), this);
+    btn_sub = new QPushButton(tr("Subfilter"), this);
     
     btn_add->setGeometry(10, 215, 100, 20);
     btn_remove->setGeometry(400, 215, 100, 20);
     btn_moveup->setGeometry(500, 215, 100, 20);
     btn_movedown->setGeometry(600, 215, 100, 20);
+    btn_sub->setGeometry(700, 215, 90, 20);
     
     connect(btn_add, SIGNAL(clicked()), this, SLOT(addClicked()));
     connect(btn_remove, SIGNAL(clicked()), this, SLOT(rmvClicked()));
     connect(btn_moveup, SIGNAL(clicked()), this, SLOT(upClicked()));
     connect(btn_movedown, SIGNAL(clicked()), this, SLOT(downClicked()));
+    connect(btn_sub, SIGNAL(clicked()), this, SLOT(setSub()));
     
     QLabel *r_label = new QLabel(tr("Red: "), this);
     r_label->setGeometry(10, 255, 50, 20);
@@ -432,6 +435,24 @@ void AC_MainWindow::downClicked() {
     
 }
 
+void AC_MainWindow::setSub() {
+    int row = filters->currentIndex();
+    if(row != -1) {
+        std::ostringstream stream;
+        //QListWidgetItem *item = filters->item(row);
+        QString filter_num = filters->currentText();
+        int value_index = filter_map[filter_num.toStdString()].first;
+        int filter_index = filter_map[filter_num.toStdString()].second;
+        if(value_index == 0) {
+        	stream << "SubFilter set to: " << filter_num.toStdString() << "\n";
+        	stream << "SubFilter index: " << filter_index << "\n";
+            playback->setSubFilter(filter_index);
+            QString l = stream.str().c_str();
+            Log(l);
+        }
+    }
+}
+
 void AC_MainWindow::Log(const QString &s) {
     QString text;
     text = log_text->toPlainText();
diff --git a/src/main_window.h b/src/main_window.h
index 4cff4a7..a265b5d 100755
--- a/src/main_window.h
+++ b/src/main_window.h
@@ -22,7 +22,7 @@ public:
     bool startCamera(int res, int dev, const QString &outdir, bool record, int type);
     bool startVideo(const QString &filename, const QString &outdir, bool record, int type);
     QListWidget /**filters,*/ *custom_filters;
-    QPushButton *btn_add, *btn_remove, *btn_moveup, *btn_movedown;
+    QPushButton *btn_add, *btn_remove, *btn_moveup, *btn_movedown, *btn_sub;
     QTextEdit *log_text;
     QCheckBox *chk_negate;
     QComboBox *combo_rgb;
@@ -39,6 +39,7 @@ public slots:
     void addClicked();
     void rmvClicked();
     void upClicked();
+    void setSub();
     void downClicked();
     void file_Exit();
     void file_NewVideo();
diff --git a/src/playback_thread.cpp b/src/playback_thread.cpp
index bd71065..5afadd8 100755
--- a/src/playback_thread.cpp
+++ b/src/playback_thread.cpp
@@ -128,6 +128,12 @@ void Playback::setIndexChanged(std::string value) {
     alpha = 1.0;
 }
 
+void Playback::setSubFilter(int index) {
+    mutex.lock();
+    ac::setSubFilter(index);
+    mutex.unlock();
+}
+
 void Playback::setSingleMode(bool val) {
     single_mode = val;
 }
diff --git a/src/playback_thread.h b/src/playback_thread.h
index ad495be..ca56615 100755
--- a/src/playback_thread.h
+++ b/src/playback_thread.h
@@ -63,6 +63,7 @@ public:
     void drawEffects(cv::Mat &frame);
     void filterFade(cv::Mat &frame, std::pair<int, int> &filter1, std::pair<int, int> &filter2, double alpha);
     void reset_filters();
+    void setSubFilter(int index);
 signals:
     void procImage(const QImage image);
     void stopRecording();