diff --git a/compare.html b/compare.html
index a9a5399..67f1313 100644
--- a/compare.html
+++ b/compare.html
@@ -342,7 +342,7 @@ <h3>
 					<span class="flat keys"><span>m</span></span>
 				</button>
 				<button id="tonecurvebtn">
-					<img src="res/histogram.svg" width="20">
+					<img src="res/tonecurve.svg" width="20">
 					<span class="en">Tone Curve Estimation</span>
 					<span class="ja">トーンカーブ推定</span>
 					<span class="flat keys"><span>t</span></span>
@@ -491,7 +491,7 @@ <h3>
 		<div>
 			<div class="header">
 				<h3>
-					<img src="res/histogram.svg" width="20">
+					<img src="res/tonecurve.svg" width="20">
 					<span class="en">Tone Curve Estimation</span>
 					<span class="ja">トーンカーブ推定</span>
 				</h3>
diff --git a/res/tonecurve.svg b/res/tonecurve.svg
new file mode 100644
index 0000000..41a4642
--- /dev/null
+++ b/res/tonecurve.svg
@@ -0,0 +1,18 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<svg version="1.2" baseProfile="tiny" width="40mm" height="40mm" viewBox="0 0 4000 4000" preserveAspectRatio="xMidYMid" fill-rule="evenodd" stroke-width="28.222" stroke-linejoin="round" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" xml:space="preserve">
+ <g visibility="visible" id="MasterSlide_1_標準">
+  <desc>Master slide
+  </desc>
+  <rect fill="none" stroke="none" x="0" y="0" width="4000" height="4000"/>
+ </g>
+ <g visibility="visible" id="Slide_1_page14">
+  <g>
+   <path fill="rgb(255,255,255)" stroke="none" d="M 2000,3200 L 500,3200 500,800 3500,800 3500,3200 2000,3200 Z"/>
+   <path fill="none" stroke="rgb(0,0,0)" id="Drawing_1_0" stroke-width="200" stroke-linejoin="round" d="M 2000,3200 L 500,3200 500,800 3500,800 3500,3200 2000,3200 Z"/>
+  </g>
+  <g>
+   <path fill="none" stroke="rgb(0,0,0)" id="Drawing_2_0" stroke-width="100" stroke-linejoin="round" stroke-linecap="round" d="M 3400,900 C 3000,900 2000,1200 1800,1900 1600,2600 1200,2900 600,3100"/>
+  </g>
+ </g>
+</svg>
\ No newline at end of file