diff --git a/SwiftProject/SwiftProject/Project/Util/PlayByTransferConvertor.swift b/SwiftProject/SwiftProject/Project/Util/PlayByTransferConvertor.swift
index 61a7774..9c40447 100644
--- a/SwiftProject/SwiftProject/Project/Util/PlayByTransferConvertor.swift
+++ b/SwiftProject/SwiftProject/Project/Util/PlayByTransferConvertor.swift
@@ -133,7 +133,7 @@ class PlayByTransferConvertor {
             return lastImg!
         }
         else {
-            var drawImg = UIImage(ciImage: lastImg!)
+            let drawImg = UIImage(ciImage: lastImg!)
             let drawImageSize = drawImg.size
             let newImgSize = CGSizeMake(drawImageSize.width * scale, drawImageSize.height * scale)
             let newRect = CGRect(origin: CGPoint(x: (drawImageSize.width - newImgSize.width) * 0.5, y: (drawImageSize.height - newImgSize.height) * 0.5), size: newImgSize)