diff --git a/toonz/sources/common/tunit/tunit.cpp b/toonz/sources/common/tunit/tunit.cpp
index 2d38202..1d6063e 100644
--- a/toonz/sources/common/tunit/tunit.cpp
+++ b/toonz/sources/common/tunit/tunit.cpp
@@ -347,14 +347,15 @@ TMeasureManager::TMeasureManager() {
   m->add(cameraYFld.clone());
   add(m);
 
-  const double stage_inch = 53.33333;  // Consider changing to 120 or 160
+  const double stage_inch        = 53.33333;
+  const double stage_standardDpi = 120;
 
   TUnit fxLength(L"fxLength"),
       fxInch(L"in", new TSimpleUnitConverter(1 / stage_inch)),
       fxCm(L"cm", new TSimpleUnitConverter(2.54 / stage_inch)),
       fxMm(L"mm", new TSimpleUnitConverter(25.4 / stage_inch)),
       fxXfld(L"fld", new TSimpleUnitConverter(2 / stage_inch)),
-      fxPx(L"px", new TSimpleUnitConverter(1));
+      fxPx(L"px", new TSimpleUnitConverter(stage_standardDpi / stage_inch));
   fxInch.addExtension(L"inch");
   fxInch.addExtension(L"\"");
   fxInch.addExtension(L"''");
diff --git a/toonz/sources/include/toonz/stage.h b/toonz/sources/include/toonz/stage.h
index af6f99e..c490aa8 100644
--- a/toonz/sources/include/toonz/stage.h
+++ b/toonz/sources/include/toonz/stage.h
@@ -43,7 +43,7 @@ namespace Stage {
 //=============================================================================
 
 DVVAR extern const double inch;
-DVVAR extern const double vectorDpi;
+DVVAR extern const double standardDpi;
 
 class Visitor;
 struct VisitArgs;
diff --git a/toonz/sources/include/toonz/tcamera.h b/toonz/sources/include/toonz/tcamera.h
index 3bf62b7..a713606 100644
--- a/toonz/sources/include/toonz/tcamera.h
+++ b/toonz/sources/include/toonz/tcamera.h
@@ -42,6 +42,9 @@ Constructs TCamera with default value, size (12,9) and resolution (768,576).
   Constructs TCamera with default value, size (36, 20.25) and resolution
 (1920,1080).
 - 05/31/16
+Constructs TCamera with default value, size (16, 9) and resolution
+(1920,1080).
+- 08/16/16
 */
   TCamera();
 
diff --git a/toonz/sources/include/toonz/tscenehandle.h b/toonz/sources/include/toonz/tscenehandle.h
index fab6259..bc8ded5 100644
--- a/toonz/sources/include/toonz/tscenehandle.h
+++ b/toonz/sources/include/toonz/tscenehandle.h
@@ -54,6 +54,8 @@ public:
 
   void notifyPreferenceChanged() { emit preferenceChanged(); }
 
+  void notifyPixelUnitSelected(bool on) { emit pixelUnitSelected(on); }
+
   void setDirtyFlag(bool dirtyFlag) {
     if (m_dirtyFlag == dirtyFlag) return;
     m_dirtyFlag = dirtyFlag;
@@ -75,6 +77,7 @@ signals:
   void castFolderAdded(const TFilePath &path);
   void nameSceneChanged();
   void preferenceChanged();
+  void pixelUnitSelected(bool on);
 };
 
 #endif  // TSCENEHANDLE_H
diff --git a/toonz/sources/toonz/camerasettingspopup.cpp b/toonz/sources/toonz/camerasettingspopup.cpp
index ec52cd0..75da3d1 100644
--- a/toonz/sources/toonz/camerasettingspopup.cpp
+++ b/toonz/sources/toonz/camerasettingspopup.cpp
@@ -244,7 +244,8 @@ void CameraSettingsPopup::updateFields() {
   TCamera *camera = cameraObject->getCamera();
   if (Preferences::instance()->getPixelsOnly()) {
     TDimension res = camera->getRes();
-    camera->setSize(TDimensionD(res.lx / Stage::inch, res.ly / Stage::inch));
+    camera->setSize(
+        TDimensionD(res.lx / Stage::standardDpi, res.ly / Stage::standardDpi));
   }
   if (camera) m_cameraSettingsWidget->setFields(camera);
 }
diff --git a/toonz/sources/toonz/iocommand.cpp b/toonz/sources/toonz/iocommand.cpp
index d9f6345..f1b35d0 100644
--- a/toonz/sources/toonz/iocommand.cpp
+++ b/toonz/sources/toonz/iocommand.cpp
@@ -1257,8 +1257,8 @@ bool IoCmd::saveSceneIfNeeded(QString msg) {
 void IoCmd::newScene() {
   RenderingSuspender suspender;
   TApp *app        = TApp::instance();
-  double cameraDpi = 53.33333;  // used to be 64, consider changing to 120 or
-                                // 160
+  double cameraDpi = 120;  // used to be 64 and 53.33333
+
   if (!saveSceneIfNeeded(QApplication::tr("New Scene"))) return;
 
   IconGenerator::instance()->clearRequests();
@@ -1861,6 +1861,35 @@ bool IoCmd::loadScene(const TFilePath &path, bool updateRecentFile,
   QAction *act = CommandManager::instance()->getAction(MI_RevertScene);
   if (act) act->setEnabled(exist);
 
+  // check if the output dpi is incompatible with pixels only mode
+  if (Preferences::instance()->getPixelsOnly()) {
+    TPointD dpi = scene->getCurrentCamera()->getDpi();
+    if (!areAlmostEqual(dpi.x, Stage::standardDpi) ||
+        !areAlmostEqual(dpi.y, Stage::standardDpi)) {
+      QString question = QObject::tr(
+          "This scene is incompatible with pixels only mode of the current "
+          "OpenToonz version.\nWhat would you like to do?");
+      QString turnOffPixelAnswer = QObject::tr("Turn off pixels only mode");
+      QString resizeSceneAnswer =
+          QObject::tr("Keep pixels only mode on and resize the scene");
+      int ret =
+          DVGui::MsgBox(question, turnOffPixelAnswer, resizeSceneAnswer, 0);
+      if (ret == 0) {
+      }                     // do nothing
+      else if (ret == 1) {  // Turn off pixels only mode
+        Preferences::instance()->setPixelsOnly(false);
+        app->getCurrentScene()->notifyPixelUnitSelected(false);
+      } else {  // ret = 2 : Resize the scene
+        TDimensionD camSize = scene->getCurrentCamera()->getSize();
+        TDimension camRes(camSize.lx * Stage::standardDpi,
+                          camSize.ly * Stage::standardDpi);
+        scene->getCurrentCamera()->setRes(camRes);
+        app->getCurrentScene()->setDirtyFlag(true);
+        app->getCurrentXsheet()->notifyXsheetChanged();
+      }
+    }
+  }
+
   printf("%s:%s loadScene() completed :\n", __FILE__, __FUNCTION__);
   return true;
 }
diff --git a/toonz/sources/toonz/preferencespopup.cpp b/toonz/sources/toonz/preferencespopup.cpp
index c76a3c9..f61fbc3 100644
--- a/toonz/sources/toonz/preferencespopup.cpp
+++ b/toonz/sources/toonz/preferencespopup.cpp
@@ -27,6 +27,7 @@
 #include "toonz/tcamera.h"
 #include "toonz/levelproperties.h"
 #include "toonz/tonionskinmaskhandle.h"
+#include "toonz/stage.h"
 
 // TnzCore includes
 #include "tsystem.h"
@@ -217,22 +218,22 @@ Preferences::LevelFormat PreferencesPopup::FormatProperties::levelFormat()
 void PreferencesPopup::onPixelsOnlyChanged(int index) {
   bool enabled = index == Qt::Checked;
   if (enabled) {
-    m_pref->setDefLevelDpi(53.33333);
+    m_pref->setDefLevelDpi(Stage::standardDpi);
     m_pref->setPixelsOnly(true);
     TCamera *camera;
     camera =
         TApp::instance()->getCurrentScene()->getScene()->getCurrentCamera();
     TDimension camRes = camera->getRes();
     TDimensionD camSize;
-    camSize.lx = camRes.lx / 53.33333;
-    camSize.ly = camRes.ly / 53.33333;
+    camSize.lx = camRes.lx / Stage::standardDpi;
+    camSize.ly = camRes.ly / Stage::standardDpi;
     camera->setSize(camSize);
     TDimension cleanupRes = CleanupSettingsModel::instance()
                                 ->getCurrentParameters()
                                 ->m_camera.getRes();
     TDimensionD cleanupSize;
-    cleanupSize.lx = cleanupRes.lx / 53.33333;
-    cleanupSize.ly = cleanupRes.ly / 53.33333;
+    cleanupSize.lx = cleanupRes.lx / Stage::standardDpi;
+    cleanupSize.ly = cleanupRes.ly / Stage::standardDpi;
     CleanupSettingsModel::instance()->getCurrentParameters()->m_camera.setSize(
         cleanupSize);
     m_pref->storeOldUnits();
@@ -241,7 +242,7 @@ void PreferencesPopup::onPixelsOnlyChanged(int index) {
     m_unitOm->setDisabled(true);
     m_cameraUnitOm->setDisabled(true);
     m_defLevelDpi->setDisabled(true);
-    m_defLevelDpi->setValue(53.33333);
+    m_defLevelDpi->setValue(Stage::standardDpi);
     m_defLevelWidth->setMeasure("camera.lx");
     m_defLevelHeight->setMeasure("camera.ly");
     m_defLevelWidth->setValue(m_pref->getDefLevelWidth());
@@ -275,6 +276,15 @@ void PreferencesPopup::onPixelsOnlyChanged(int index) {
   }
 }
 
+//-----------------------------------------------------------------------------
+
+void PreferencesPopup::onPixelUnitExternallySelected(bool on) {
+  // call slot function onPixelsOnlyChanged() accordingly
+  m_pixelsOnlyCB->setCheckState((on) ? Qt::Checked : Qt::Unchecked);
+}
+
+//-----------------------------------------------------------------------------
+
 void PreferencesPopup::onUnitChanged(int index) {
   if (index == 4 && m_pixelsOnlyCB->isChecked() == false) {
     m_pixelsOnlyCB->setCheckState(Qt::Checked);
@@ -1844,6 +1854,11 @@ PreferencesPopup::PreferencesPopup()
                        SLOT(onStyleSheetTypeChanged(int)));
   ret = ret && connect(m_pixelsOnlyCB, SIGNAL(stateChanged(int)),
                        SLOT(onPixelsOnlyChanged(int)));
+  // pixels unit may deactivated externally on loading scene (see
+  // IoCmd::loadScene())
+  ret = ret && connect(TApp::instance()->getCurrentScene(),
+                       SIGNAL(pixelUnitSelected(bool)), this,
+                       SLOT(onPixelUnitExternallySelected(bool)));
   ret = ret && connect(m_unitOm, SIGNAL(currentIndexChanged(int)),
                        SLOT(onUnitChanged(int)));
   ret = ret && connect(m_cameraUnitOm, SIGNAL(currentIndexChanged(int)),
diff --git a/toonz/sources/toonz/preferencespopup.h b/toonz/sources/toonz/preferencespopup.h
index e2cb9a7..7677d22 100644
--- a/toonz/sources/toonz/preferencespopup.h
+++ b/toonz/sources/toonz/preferencespopup.h
@@ -79,6 +79,7 @@ private:
 private slots:
 
   void onPixelsOnlyChanged(int index);
+  void onPixelUnitExternallySelected(bool on);
   void onUnitChanged(int index);
   void onCameraUnitChanged(int index);
   void onRoomChoiceChanged(int index);
diff --git a/toonz/sources/toonz/sceneviewer.cpp b/toonz/sources/toonz/sceneviewer.cpp
index 826eb7f..d039b34 100644
--- a/toonz/sources/toonz/sceneviewer.cpp
+++ b/toonz/sources/toonz/sceneviewer.cpp
@@ -1864,8 +1864,12 @@ void SceneViewer::zoomQt(bool forward, bool reset) {
 /*! a factor for getting pixel-based zoom ratio
 */
 double SceneViewer::getDpiFactor() {
+  // When the current unit is "pixels", always use a standard dpi
+  if (Preferences::instance()->getPixelsOnly()) {
+    return Stage::inch / Stage::standardDpi;
+  }
   // When preview mode, use a camera DPI
-  if (isPreviewEnabled()) {
+  else if (isPreviewEnabled()) {
     return Stage::inch /
            TApp::instance()
                ->getCurrentScene()
diff --git a/toonz/sources/toonzlib/stage.cpp b/toonz/sources/toonzlib/stage.cpp
index 3c9610a..ad340da 100644
--- a/toonz/sources/toonzlib/stage.cpp
+++ b/toonz/sources/toonzlib/stage.cpp
@@ -69,8 +69,8 @@ typedef std::vector<Player> PlayerSet;
    thickness of
                 images .pli.
 */
-const double Stage::inch      = 53.33333;  // consider changing to 120 or 160
-const double Stage::vectorDpi = 53.3333;
+const double Stage::inch        = 53.33333;
+const double Stage::standardDpi = 120;
 
 namespace {
 void updateOnionSkinSize(const PlayerSet &players) {
diff --git a/toonz/sources/toonzlib/tcamera.cpp b/toonz/sources/toonzlib/tcamera.cpp
index 9772662..99d68c9 100644
--- a/toonz/sources/toonzlib/tcamera.cpp
+++ b/toonz/sources/toonzlib/tcamera.cpp
@@ -10,7 +10,8 @@
 
 TCamera::TCamera()
     //: m_size(12, 9), m_res(768, 576), m_xPrevalence(true)
-    : m_size(36, 20.25),
+    //: m_size(36, 20.25),
+    : m_size(16, 9),
       m_res(1920, 1080),
       m_xPrevalence(true) {}
 
diff --git a/toonz/sources/toonzqt/camerasettingswidget.cpp b/toonz/sources/toonzqt/camerasettingswidget.cpp
index 2da8e22..acfd5e8 100644
--- a/toonz/sources/toonzqt/camerasettingswidget.cpp
+++ b/toonz/sources/toonzqt/camerasettingswidget.cpp
@@ -759,8 +759,8 @@ void CameraSettingsWidget::onYResChanged() {
 
 void CameraSettingsWidget::onXDpiChanged() {
   if (Preferences::instance()->getPixelsOnly()) {
-    m_xDpiFld->setValue(Stage::inch);
-    m_yDpiFld->setValue(Stage::inch);
+    m_xDpiFld->setValue(Stage::standardDpi);
+    m_yDpiFld->setValue(Stage::standardDpi);
   } else if (m_fspChk->isChecked())
     m_yDpiFld->setValue(m_xDpiFld->getValue());
 
@@ -781,8 +781,8 @@ void CameraSettingsWidget::onXDpiChanged() {
 
 void CameraSettingsWidget::onYDpiChanged() {
   if (Preferences::instance()->getPixelsOnly()) {
-    m_xDpiFld->setValue(Stage::inch);
-    m_yDpiFld->setValue(Stage::inch);
+    m_xDpiFld->setValue(Stage::standardDpi);
+    m_yDpiFld->setValue(Stage::standardDpi);
   } else if (m_fspChk->isChecked())
     m_xDpiFld->setValue(m_yDpiFld->getValue());
 
@@ -850,8 +850,8 @@ void CameraSettingsWidget::onPresetSelected(const QString &str) {
     }
 
     if (Preferences::instance()->getPixelsOnly()) {
-      m_lxFld->setValue(xres / Stage::inch);
-      m_lyFld->setValue(yres / Stage::inch);
+      m_lxFld->setValue(xres / Stage::standardDpi);
+      m_lyFld->setValue(yres / Stage::standardDpi);
     }
 
     if (m_forCleanup && m_offsX && m_offsY && !xoffset.isEmpty() &&
diff --git a/toonz/sources/toonzqt/cleanupcamerasettingswidget.cpp b/toonz/sources/toonzqt/cleanupcamerasettingswidget.cpp
index b02a541..b158188 100644
--- a/toonz/sources/toonzqt/cleanupcamerasettingswidget.cpp
+++ b/toonz/sources/toonzqt/cleanupcamerasettingswidget.cpp
@@ -95,7 +95,7 @@ void CleanupCameraSettingsWidget::setFields(
   if (Preferences::instance()->getPixelsOnly()) {
     TDimension res = cleanupParameters->m_camera.getRes();
     cleanupParameters->m_camera.setSize(
-        TDimensionD(res.lx / Stage::inch, res.ly / Stage::inch));
+        TDimensionD(res.lx / Stage::standardDpi, res.ly / Stage::standardDpi));
   }
   m_cameraWidget->setFields(&cleanupParameters->m_camera);
   m_offsX->setValue(cleanupParameters->m_offx);
diff --git a/toonz/sources/toonzqt/dvdialog.cpp b/toonz/sources/toonzqt/dvdialog.cpp
index 3692f7e..281586e 100644
--- a/toonz/sources/toonzqt/dvdialog.cpp
+++ b/toonz/sources/toonzqt/dvdialog.cpp
@@ -31,7 +31,7 @@
 
 using namespace DVGui;
 
-QString DialogTitle = QObject::tr("OpenToonz 1.0");
+QString DialogTitle = QObject::tr("OpenToonz 1.1");
 
 //=============================================================================
 namespace {