diff --git a/app/src/main/java/xdsopl/robot36/ImageView.java b/app/src/main/java/xdsopl/robot36/ImageView.java
index d4cd490..f5031e3 100644
--- a/app/src/main/java/xdsopl/robot36/ImageView.java
+++ b/app/src/main/java/xdsopl/robot36/ImageView.java
@@ -124,6 +124,16 @@ public class ImageView extends SurfaceView implements SurfaceHolder.Callback {
 
         thread.start();
     }
+    void softer_image() {
+        synchronized (thread) {
+            rsDecoder.invoke_incr_blur();
+        }
+    }
+    void sharper_image() {
+        synchronized (thread) {
+            rsDecoder.invoke_decr_blur();
+        }
+    }
     void debug_sync() {
         synchronized (thread) {
             rsDecoder.invoke_debug_sync();
diff --git a/app/src/main/java/xdsopl/robot36/MainActivity.java b/app/src/main/java/xdsopl/robot36/MainActivity.java
index 3611aa3..2fb9387 100644
--- a/app/src/main/java/xdsopl/robot36/MainActivity.java
+++ b/app/src/main/java/xdsopl/robot36/MainActivity.java
@@ -61,6 +61,12 @@ public class MainActivity extends Activity {
 
         //noinspection SimplifiableIfStatement
         switch (id) {
+            case R.id.action_softer_image:
+                view.softer_image();
+                return true;
+            case R.id.action_sharper_image:
+                view.sharper_image();
+                return true;
             case R.id.action_robot36_mode:
                 view.robot36_mode();
                 return true;
diff --git a/app/src/main/res/menu/menu_main.xml b/app/src/main/res/menu/menu_main.xml
index bed4961..673a9b4 100644
--- a/app/src/main/res/menu/menu_main.xml
+++ b/app/src/main/res/menu/menu_main.xml
@@ -1,5 +1,10 @@
 <menu xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:tools="http://schemas.android.com/tools" tools:context=".MainActivity">
+
+    <item android:id="@+id/action_softer_image" android:title="@string/action_softer_image"
+        android:orderInCategory="100" android:showAsAction="never" />
+    <item android:id="@+id/action_sharper_image" android:title="@string/action_sharper_image"
+        android:orderInCategory="100" android:showAsAction="never" />
     <item android:id="@+id/action_robot36_mode" android:title="@string/action_robot36_mode"
         android:orderInCategory="100" android:showAsAction="never" />
     <item android:id="@+id/action_robot72_mode" android:title="@string/action_robot72_mode"
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index 1e4ab79..bb1246d 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -14,5 +14,7 @@
     <string name="action_scottie2_mode">Scottie2 Mode</string>
     <string name="action_scottieDX_mode">ScottieDX Mode</string>
     <string name="action_wrasseSC2_180_mode">WrasseSC2-180 Mode</string>
+    <string name="action_softer_image">Softer Image</string>
+    <string name="action_sharper_image">Sharper Image</string>
 
 </resources>
diff --git a/app/src/main/rs/blur.rsh b/app/src/main/rs/blur.rsh
index ad02817..b7e1daa 100644
--- a/app/src/main/rs/blur.rsh
+++ b/app/src/main/rs/blur.rsh
@@ -19,6 +19,16 @@ limitations under the License.
 
 #include "exports.rsh"
 
+void incr_blur()
+{
+    blur_power = blur_power < 6 ? blur_power + 1 : blur_power;
+}
+
+void decr_blur()
+{
+    blur_power = blur_power >= 0 ? blur_power - 1 : blur_power;
+}
+
 /* used the following code generator:
 #include <math.h>
 #include <stdio.h>