diff --git a/ChangeLog b/ChangeLog
index 0df678a..8d1b16a 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,6 @@
+2022-11-26:
+- adding histogram
+
 2022-11-10:
 - support for DNG file export
 
diff --git a/configuration.cc b/configuration.cc
index 0b93220..f67e6e7 100644
--- a/configuration.cc
+++ b/configuration.cc
@@ -76,6 +76,12 @@ void Configuration::SaveConfig(std::string filename) {
 	cbe = gtk_bin_get_child(GTK_BIN(cb));
 	jp.AddObject("device", (string) gtk_entry_get_text(GTK_ENTRY(cbe)));
 
+
+	//
+	// histogram settings
+	jp.AddObject("histogram_log", histogram_log);
+
+
 	//
 	// save button config
 	for (i = 0; i < BTN_PRESET_MAX; i++) {
@@ -137,6 +143,7 @@ void Configuration::LoadConfig(std::string filename) {
 			gtk_entry_set_text(GTK_ENTRY(cbdevice), vstr.c_str());
 		}
 
+		jp.GetValueInt("histogram_log", &histogram_log);
 
 		//
 		// start streaming if a device was selected.
diff --git a/configuration.h b/configuration.h
index 67485e3..7154b62 100644
--- a/configuration.h
+++ b/configuration.h
@@ -23,6 +23,8 @@ private:
 public:
 	char *debugpath;
 	char *readdumppath;
+	int histogram_log = 1;			// logarithmic or linear scale
+
 
 	Configuration();
 	~Configuration();
diff --git a/gui.h b/gui.h
index e8530ba..ce54796 100644
--- a/gui.h
+++ b/gui.h
@@ -105,6 +105,7 @@ G_MODULE_EXPORT void cb_histogramda_draw(GtkWidget *area, cairo_t *cr, int w, in
 G_MODULE_EXPORT void cb_histogramda_motion (GtkWidget *widget, GdkEvent *event, gpointer data);
 G_MODULE_EXPORT void cb_histogramda_btnpress (GtkWidget *widget, gpointer data);
 G_MODULE_EXPORT void cb_histogramda_btnrelease (GtkWidget *widget, gpointer data);
+G_MODULE_EXPORT void cb_histogramda_keypress (GtkWidget *widget, GdkEventKey *event, gpointer data);
 
 
 
diff --git a/histogram.cc b/histogram.cc
index 2378ed8..a38cfeb 100644
--- a/histogram.cc
+++ b/histogram.cc
@@ -25,7 +25,6 @@ int histogram_pressed_x;                // window x-coordinate when pressing a b
 int histogram_released_x;               // window x-coordinate when releasing a button
 int histogram_pressed = 0;              // indicates button pressed or not
 int histogram_zoomed = 0;               // indicates zoom
-int histogram_log = 1;                  // logarithmic or linear scale
 
 extern GtkBuilder *_builder_;			// work around for threads
 
@@ -73,7 +72,7 @@ void cb_histogramda_draw(GtkWidget *area, cairo_t *cr, int w, int h, gpointer da
 		int histogram_scale = histogram_width - 1 > 0 ? histogram_width - 1 : 1;
     	for (int i = 0; i < histogram_width; i++) {
 	  px = HISTOGRAM_MARGIN + ((clientw-HISTOGRAM_MARGIN*2) * i) / histogram_scale;
-	  if (histogram_log)
+	  if (config.histogram_log)
 	    py2 = (clienth-HISTOGRAM_MARGIN) - ((clienth-HISTOGRAM_MARGIN*2) * log10(histogram[chan][histogram_zoom_start+i]+1) / log10(histogram_max));
 	  else
 	    py2 = (clienth-HISTOGRAM_MARGIN) - ((clienth-HISTOGRAM_MARGIN*2) * histogram[chan][histogram_zoom_start+i] / histogram_max);
@@ -99,7 +98,8 @@ void cb_histogramda_draw(GtkWidget *area, cairo_t *cr, int w, int h, gpointer da
     }
 
 	// draw some text
-    snprintf (txt, 255, "%d", histogram_max);
+    if (config.histogram_log)    snprintf (txt, 255, "%d - Log", histogram_max);
+    else					     snprintf (txt, 255, "%d - Lin", histogram_max);
 
 	for (int i = 0; i < 5; i++) {
 		int dx, dy;
@@ -224,3 +224,17 @@ void cb_histogramda_btnrelease (GtkWidget *widget, gpointer data) {
     }
   }
 };
+
+
+void cb_histogramda_keypress (GtkWidget *widget, GdkEventKey *event, gpointer data) {
+
+	printf ("%s:%d %s\n", __FILE__, __LINE__, __FUNCTION__);
+
+	if (event == NULL) return;
+
+	else if (event->keyval == 'l') {
+		if (config.histogram_log == 0) config.histogram_log = 1;
+		else  config.histogram_log = 0;
+	}
+};
+
diff --git a/simpleskycam.ui b/simpleskycam.ui
index 172e65c..08f4a45 100644
--- a/simpleskycam.ui
+++ b/simpleskycam.ui
@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="UTF-8"?>
-<!-- Generated with glade 3.38.2 -->
+<!-- Generated with glade 3.40.0 -->
 <interface>
   <requires lib="gtk+" version="3.18"/>
   <object class="GtkAdjustment" id="detect-pos-adjbright">
@@ -22,18 +22,6 @@
         <property name="orientation">vertical</property>
         <property name="spacing">3</property>
         <property name="baseline-position">top</property>
-        <child>
-          <object class="GtkDrawingArea" id="temp-da">
-            <property name="visible">True</property>
-            <property name="can-focus">False</property>
-            <signal name="draw" handler="cb_imagetempda_draw" swapped="no"/>
-          </object>
-          <packing>
-            <property name="expand">True</property>
-            <property name="fill">True</property>
-            <property name="position">0</property>
-          </packing>
-        </child>
         <child>
           <object class="GtkBox">
             <property name="visible">True</property>
@@ -224,7 +212,7 @@
           <packing>
             <property name="expand">False</property>
             <property name="fill">False</property>
-            <property name="position">1</property>
+            <property name="position">0</property>
           </packing>
         </child>
         <child>
@@ -442,6 +430,18 @@
           <packing>
             <property name="expand">False</property>
             <property name="fill">False</property>
+            <property name="position">1</property>
+          </packing>
+        </child>
+        <child>
+          <object class="GtkDrawingArea" id="temp-da">
+            <property name="visible">True</property>
+            <property name="can-focus">False</property>
+            <signal name="draw" handler="cb_imagetempda_draw" swapped="no"/>
+          </object>
+          <packing>
+            <property name="expand">True</property>
+            <property name="fill">True</property>
             <property name="position">2</property>
           </packing>
         </child>
@@ -454,11 +454,12 @@
     <child>
       <object class="GtkDrawingArea" id="histogram-da">
         <property name="visible">True</property>
-        <property name="can-focus">False</property>
-        <property name="events">GDK_POINTER_MOTION_MASK | GDK_BUTTON_MOTION_MASK | GDK_BUTTON1_MOTION_MASK | GDK_BUTTON2_MOTION_MASK | GDK_BUTTON3_MOTION_MASK | GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK | GDK_STRUCTURE_MASK</property>
+        <property name="can-focus">True</property>
+        <property name="events">GDK_EXPOSURE_MASK | GDK_POINTER_MOTION_MASK | GDK_POINTER_MOTION_HINT_MASK | GDK_BUTTON_MOTION_MASK | GDK_BUTTON1_MOTION_MASK | GDK_BUTTON2_MOTION_MASK | GDK_BUTTON3_MOTION_MASK | GDK_BUTTON_PRESS_MASK | GDK_BUTTON_RELEASE_MASK | GDK_KEY_PRESS_MASK | GDK_KEY_RELEASE_MASK | GDK_ENTER_NOTIFY_MASK | GDK_LEAVE_NOTIFY_MASK | GDK_FOCUS_CHANGE_MASK | GDK_STRUCTURE_MASK | GDK_PROPERTY_CHANGE_MASK | GDK_VISIBILITY_NOTIFY_MASK | GDK_PROXIMITY_IN_MASK | GDK_PROXIMITY_OUT_MASK | GDK_SUBSTRUCTURE_MASK | GDK_SCROLL_MASK | GDK_TOUCH_MASK | GDK_SMOOTH_SCROLL_MASK | GDK_TOUCHPAD_GESTURE_MASK | GDK_TABLET_PAD_MASK</property>
         <signal name="button-press-event" handler="cb_histogramda_btnpress" swapped="no"/>
         <signal name="button-release-event" handler="cb_histogramda_btnrelease" swapped="no"/>
         <signal name="draw" handler="cb_histogramda_draw" swapped="no"/>
+        <signal name="key-press-event" handler="cb_histogramda_keypress" swapped="no"/>
         <signal name="motion-notify-event" handler="cb_histogramda_motion" swapped="no"/>
       </object>
     </child>