diff --git a/scripts/paint.js b/scripts/paint.js
index c5f4e50..807f9c9 100644
--- a/scripts/paint.js
+++ b/scripts/paint.js
@@ -892,46 +892,48 @@ closeModal ()
 function
 applyResolution ()
 {
-  if (!(((changeWidth.value < canvasRoot.width)
-         || changeHeight.value < canvasRoot.height)
-        && !(window.confirm ('指定されている幅もしくは高さの値がサイズ変更前よりも小さいです．\nこのままだと右端もしくは下端が変更後のサイズに合わせてカットされてしまいます．\nよろしいかな?????'))))
-    {
-      canvasWidth = Math.max (32, Math.min (changeWidth.value, 640));
-      canvasHeight = Math.max (24, Math.min (changeHeight.value, 480));
-
-      canvasArea.style.width = canvasWidth + 'px';
-      canvasArea.style.height = canvasHeight + 'px';
+  if ((changeWidth.value >= canvasRoot.width)
+      && (changeHeight.value >= canvasRoot.height))
+    return;
 
-      for (let i = 0; i < layerMax; ++i)
-        {
-          const canvas4replace = document.createElement ('canvas');
+  if (!(window.confirm ('指定されている幅もしくは高さの値がサイズ変更前よりも小さいです．\nこのままだと右端もしくは下端が変更後のサイズに合わせてカットされてしまいます．\nよろしいかな?????')))
+    return;
 
-          canvas4replace.width = canvasWidth;
-          canvas4replace.height = canvasHeight;
+  canvasWidth = Math.max (32, Math.min (changeWidth.value, 640));
+  canvasHeight = Math.max (24, Math.min (changeHeight.value, 480));
 
-          const canvas4replaceCtx = canvas4replace.getContext ('2d');
+  canvasArea.style.width = canvasWidth + 'px';
+  canvasArea.style.height = canvasHeight + 'px';
 
-          if (i == 0)
-            {
-              canvas4replaceCtx.fillStyle = 'white';
-              canvas4replaceCtx.fillRect (0, 0, canvasWidth, canvasHeight);
-            }
+  for (let i = 0; i < layerMax; ++i)
+    {
+      const canvas4replace = document.createElement ('canvas');
 
-          canvas4replaceCtx.drawImage (canvas[i], 0, 0);
+      canvas4replace.width = canvasWidth;
+      canvas4replace.height = canvasHeight;
 
-          canvas[i].width = canvasWidth;
-          canvas[i].height = canvasHeight;
+      const canvas4replaceCtx = canvas4replace.getContext ('2d');
 
-          canvasCtx[i].drawImage (canvas4replace, 0, 0);
+      if (i == 0)
+        {
+          canvas4replaceCtx.fillStyle = 'white';
+          canvas4replaceCtx.fillRect (0, 0, canvasWidth, canvasHeight);
         }
 
-      canvasPerfect.width = canvasRoot.width = canvasWidth;
-      canvasPerfect.height = canvasRoot.height = canvasHeight;
+      canvas4replaceCtx.drawImage (canvas[i], 0, 0);
 
-      reDraw ();
+      canvas[i].width = canvasWidth;
+      canvas[i].height = canvasHeight;
 
-      closeModal ();
+      canvasCtx[i].drawImage (canvas4replace, 0, 0);
     }
+
+  canvasPerfect.width = canvasRoot.width = canvasWidth;
+  canvasPerfect.height = canvasRoot.height = canvasHeight;
+
+  reDraw ();
+
+  closeModal ();
 }