diff --git a/.idea/blur-exif-face-tags.iml b/.idea/blur-exif-face-tags.iml
new file mode 100644
index 0000000..6807b60
--- /dev/null
+++ b/.idea/blur-exif-face-tags.iml
@@ -0,0 +1,8 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<module version="4">
+  <component name="NewModuleRootManager">
+    <content url="file://$MODULE_DIR$" />
+    <orderEntry type="jdk" jdkName="Python 3.9 (venv39-2)" jdkType="Python SDK" />
+    <orderEntry type="sourceFolder" forTests="false" />
+  </component>
+</module>
\ No newline at end of file
diff --git a/.idea/modules.xml b/.idea/modules.xml
index 611bab0..181a238 100644
--- a/.idea/modules.xml
+++ b/.idea/modules.xml
@@ -2,7 +2,7 @@
 <project version="4">
   <component name="ProjectModuleManager">
     <modules>
-      <module fileurl="file://$PROJECT_DIR$/.idea/20210828_image-xml-metadata.iml" filepath="$PROJECT_DIR$/.idea/20210828_image-xml-metadata.iml" />
+      <module fileurl="file://$PROJECT_DIR$/.idea/blur-exif-face-tags.iml" filepath="$PROJECT_DIR$/.idea/blur-exif-face-tags.iml" />
     </modules>
   </component>
 </project>
\ No newline at end of file
diff --git a/README.md b/README.md
index e889923..f10d1f1 100644
--- a/README.md
+++ b/README.md
@@ -31,4 +31,4 @@ Many thanks to
 
 * https://www.thregr.org/~wavexx/software/facedetect/#blurring-faces-within-an-image
 * "Make blur all around a rectangle in image with PIL", https://stackoverflow.com/q/56987112/6334421
-* Example image: https://unsplash.com/photos/1qfy-jDc_jo?utm_source=unsplash&utm_medium=referral&utm_content=creditShareLink
\ No newline at end of file
+* Example image: https://unsplash.com/photos/1qfy-jDc_jo?utm_source=unsplash&utm_medium=referral&utm_content=creditShareLink
diff --git a/blur.py b/blur.py
index 07e0efc..7ae8916 100644
--- a/blur.py
+++ b/blur.py
@@ -12,7 +12,7 @@ import exif
 
 class NormalizedRectangle:
     """
-    x, y, width and height are normalized: Their values are in the range [0, 1]
+    x, y, width and height are normalized: Their values are in the range [0, 1].
     """
 
     x: float
@@ -82,5 +82,19 @@ def blur_rectangle2(image_src: Path, normalized_rectangles: List[NormalizedRecta
 
     # Save image
     if image_dst is None:
-        image_dst = image_src.parent.joinpath(f'{image_src.stem}_blurred{image_src.suffix}')
+        image_dst = get_image_dst(image_src)
     im.save(image_dst)
+
+
+def get_image_dst(image: Path):
+    return image.parent.joinpath(f'{image.stem}{stem_suffix()}{image.suffix}')
+
+
+def stem_suffix():
+    """
+    Modified images will be saved with a different filename.
+    This suffix will be added to their stem.
+    """
+
+    # return ' [blurred]'
+    return '_blurred'
diff --git a/exif.py b/exif.py
index 0c7287f..bebb52d 100644
--- a/exif.py
+++ b/exif.py
@@ -23,19 +23,12 @@ class Image:
             if len(self.files) == 0:
                 raise Exception
         else:
-            raise Exception
+            raise Exception(f'{image_file}')
 
     def get_image_file(self):
         return self.files[0]
 
-    def get_xmp_metadata(self) -> AnyStr:
-        # TODO: Try to read xmp metadata from the image file itself, if there is no sidecar xmp file
-
-        xmp_sidecar = self.get_xmp_sidecar()
-        with open(xmp_sidecar, "r") as f:
-            return f.read()
-
-    def get_xmp_sidecar(self):
+    def get_xmp_file(self):
         """
         :return: The sidecar xmp file, if it exists. Otherwise None is returned.
         """
@@ -46,6 +39,17 @@ class Image:
                 return file
         return None
 
+    def get_metadata_file(self):
+        """
+        If a sidecar xmp file exists, it is preferred over the image file itself.
+
+        :return: A file containing the image metadata.
+        """
+        metadata = self.get_xmp_file()
+        if metadata is None:
+            metadata = self.get_image_file()
+        return metadata
+
     def __str__(self):
         return f'Image: {self.__dict__}'
 
@@ -75,12 +79,12 @@ class ExifImageRegion:
 
 
 def get_exif_image_regions(image: Image) -> List[ExifImageRegion]:
-    sidecar: Path = image.get_xmp_sidecar()
+    img_metadata_file: Path = image.get_metadata_file()
 
-    names_str = exec.execute_save(['exiftool', '-RegionName', str(sidecar)])
-    r_types_str = exec.execute_save(['exiftool', '-RegionType', str(sidecar)])
-    area_units_str = exec.execute_save(['exiftool', '-RegionAreaUnit', str(sidecar)])
-    rectangles_str = exec.execute_save(['exiftool', '-RegionRectangle', str(sidecar)])
+    names_str = exec.execute_save(['exiftool', '-RegionName', str(img_metadata_file)])
+    r_types_str = exec.execute_save(['exiftool', '-RegionType', str(img_metadata_file)])
+    area_units_str = exec.execute_save(['exiftool', '-RegionAreaUnit', str(img_metadata_file)])
+    rectangles_str = exec.execute_save(['exiftool', '-RegionRectangle', str(img_metadata_file)])
 
     names = names_str.strip().split(':', 1)[1].strip().split(', ')
     r_types = r_types_str.strip().split(':', 1)[1].strip().split(', ')
diff --git a/main.py b/main.py
index 5873469..3cc278d 100644
--- a/main.py
+++ b/main.py
@@ -1,3 +1,4 @@
+import os
 from pathlib import Path
 from typing import List
 
@@ -29,9 +30,18 @@ def blur_image(image: exif.Image):
 
 
 def main():
-    for child in image_directory.iterdir():
-        if child.suffix.lower() in image_extensions:
-            blur_image(exif.Image(child))
+    # Convert all images in the image_directory, including subdirectories.
+    for _, _, files in os.walk(image_directory):
+        for relative_file_str in files:
+            file: Path = Path.joinpath(image_directory, relative_file_str)
+            if file.suffix.lower() in image_extensions:
+
+                if file.stem.endswith(blur.stem_suffix()):
+                    print(f'Skipped the following image as it is already blurred:\n\t{file}')
+                elif blur.get_image_dst(file).exists():
+                    print(f'Skipped the following image as it\'s blurred output does already exist:\n\t{file}')
+                else:
+                    blur_image(exif.Image(file))
 
 
 if __name__ == '__main__':