diff --git a/iphone-photo-format.sh b/iphone-photo-format.sh
old mode 100644
new mode 100755
index fd6d962..5e68da8
--- a/iphone-photo-format.sh
+++ b/iphone-photo-format.sh
@@ -8,21 +8,22 @@ mkdir -p output
 # 遍历当前文件夹下的所有 heic 和 png 文件
 for file in *.{HEIC,heic,PNG,png,JPG}; do
 
-  # 跳过不该执行的文件
-  if [[ "$file" == "." || "$file" == ".." || "$file" == "*.heic" || "$file" == "*.png" || "$file" == "*.jpg" ]]; then
+  # 跳过不存在的文件
+  if [[ ! -f "$file" ]]; then
     continue
   fi
 
-  # 存储图片名到变量
+  # 获取图片名并创建新的文件名
   filename=$(basename "$file")
+  extension="${filename##*.}"
+  new_extension="jpg"
+  new_filename="${filename%.*}.$new_extension"
 
-  # 将文件名中的后缀替换为 .jpg
-  echo "$filename\n";
-  new_filename=${filename/.HEIC/.jpg}
-  new_filename=${new_filename/.heic/.jpg}
-  new_filename=${new_filename/.png/.jpg}
-  new_filename=${new_filename/.PNG/.jpg}
-  new_filename=${new_filename/.JPG/.jpg}
+  # 检查输出文件是否已存在
+  if [[ -e "output/$new_filename" ]]; then
+    echo "Skipping existing file: output/$new_filename"
+    continue
+  fi
 
   if [[ "${filename##*.}" == "png" || "${filename##*.}" == "PNG" ]]; then
     # 使用 ImageMagick 直接处理 PNG 图片