diff --git a/sjplayer/src/sjplayer/PostEffect.d b/sjplayer/src/sjplayer/PostEffect.d
index 15274f0..39038c2 100644
--- a/sjplayer/src/sjplayer/PostEffect.d
+++ b/sjplayer/src/sjplayer/PostEffect.d
@@ -12,7 +12,7 @@ class PostEffect {
   struct Instance {
    public:
     ///
-    align(1) float raster_fineness = 0;
+    align(1) float raster_fineness = 600;
     ///
     align(1) float raster_width = 0;
 
diff --git a/sjplayer/src/sjplayer/PostEffectController.d b/sjplayer/src/sjplayer/PostEffectController.d
index c907f0c..3885ab1 100644
--- a/sjplayer/src/sjplayer/PostEffectController.d
+++ b/sjplayer/src/sjplayer/PostEffectController.d
@@ -15,6 +15,11 @@ import sjplayer.AbstractScheduledController,
 ///
 class PostEffectController : PostEffectScheduledController, PostEffectControllerInterface {
  public:
+  ///
+  enum DamagedEffectLength = 30;
+  ///
+  enum DamagedEffectRasterWidth = 0.1;
+
   ///
   this(
       PostEffect posteffect,
@@ -25,12 +30,20 @@ class PostEffectController : PostEffectScheduledController, PostEffectController
   }
 
   override void CauseDamagedEffect() {
+    damaged_effect_frame_ = DamagedEffectLength;
   }
   override void Update() {
+    if (damaged_effect_frame_ > 0) damaged_effect_frame_--;
+
+    posteffect_.raster_width =
+      damaged_effect_frame_*1f / DamagedEffectLength *
+      DamagedEffectRasterWidth;
   }
 
  private:
   PostEffect posteffect_;
+
+  int damaged_effect_frame_;
 }
 
 private alias PostEffectScheduledController = ScheduledController!(
diff --git a/sjplayer/standalone/main.d b/sjplayer/standalone/main.d
index fc3dade..96056de 100644
--- a/sjplayer/standalone/main.d
+++ b/sjplayer/standalone/main.d
@@ -60,6 +60,7 @@ int main(string[] args) {
     const dmg = context.CalculateDamage();
     if (dmg.damage != 0) {
       "damage: %f (%f)".writefln(dmg.damage, beat);
+      context.posteffect.CauseDamagedEffect();
     }
     if (dmg.nearness != 0) {
       "nearby: %f (%f)".writefln(dmg.nearness, beat);