diff --git a/js/index.js b/js/index.js
index 3f22e2c..8666453 100644
--- a/js/index.js
+++ b/js/index.js
@@ -225,6 +225,7 @@ function reject(evt) {
 }
 
 function newImage(evt) {
+    clearPaintedMask();
     clearBackupMask();
     clearTargetMask();
     clearImgMask();
@@ -291,6 +292,10 @@ function clearImgMask() {
     imgCtx.clearRect(0, 0, imgCanvas.width, imgCanvas.height);
 }
 
+function clearPaintedMask() {
+    maskPaintCtx.clearRect(0, 0, maskPaintCanvas.width, maskPaintCanvas.height);
+}
+
 function placeImage() {
     const img = new Image();
     img.onload = function () {