diff --git a/mangle/book.py b/mangle/book.py
index 1a3e6aa..fe8edfa 100644
--- a/mangle/book.py
+++ b/mangle/book.py
@@ -30,9 +30,18 @@ import util
 
 # Sort function use to sort files in a natural order, by lowering
 # characters, and manage multi levels of integers (tome 1/ page 1.jpg, etc etc)
+# cf: See http://www.codinghorror.com/blog/archives/001018.html
 def natural_key(string_):
-    """See http://www.codinghorror.com/blog/archives/001018.html"""
-    return [int(s) if s.isdigit() else s.lower() for s in re.split(r'(\d+)', string_)]
+    l = []
+    for s in re.split(r'(\d+)', string_):
+        # QString do not have isdigit, so convert it if need
+        if isinstance(s, QtCore.QString):
+            s = unicode(s)
+        if s.isdigit():
+            l.append(int(s))
+        else:
+            l.append(s.lower())
+    return l
 
 
 class Book(object):
diff --git a/mangle/image.py b/mangle/image.py
index 67358e1..421bec3 100644
--- a/mangle/image.py
+++ b/mangle/image.py
@@ -16,20 +16,20 @@
 
 import os
 
-from PIL import Image, ImageDraw
-
+from PIL import Image, ImageDraw, ImageStat, ImageChops
 
 
 class ImageFlags:
-    Orient = 1 << 0
-    Resize = 1 << 1
-    Frame = 1 << 2
-    Quantize = 1 << 3
-    Stretch = 1 << 4
-    Split = 1 << 5         # split right then left
-    SplitRight = 1 << 6    # split only the right page
-    SplitLeft = 1 << 7     # split only the left page
+    Orient       = 1 << 0
+    Resize       = 1 << 1
+    Frame        = 1 << 2
+    Quantize     = 1 << 3
+    Stretch      = 1 << 4
+    Split        = 1 << 5         # split right then left
+    SplitRight   = 1 << 6    # split only the right page
+    SplitLeft    = 1 << 7     # split only the left page
     SplitInverse = 1 << 8  # split left then right page
+    AutoCrop     = 1 << 9  # split left then right page
 
 
 class KindleData:
@@ -179,6 +179,15 @@ def orientImage(image, size):
     return image
 
 
+# We will auto crop the image, by removing just white part around the image
+# by inverting colors, and asking a bounder box ^^
+@protect_bad_image
+def autoCropImage(image):
+    x0, y0, xend, yend = ImageChops.invert(image).getbbox()
+    image = image.crop((x0, y0, xend, yend))
+    return image
+
+
 def frameImage(image, foreground, background, size):
     widthDev, heightDev = size
     widthImg, heightImg = image.size
@@ -240,6 +249,9 @@ def convertImage(source, target, device, flags):
         raise RuntimeError('Unexpected output device %s' % device)
     # Load image from source path
     image = loadImage(source)
+
+    
+
     # Format according to palette
     image = formatImage(image)
     # Apply flag transforms
@@ -257,6 +269,10 @@ def convertImage(source, target, device, flags):
     if (flags & ImageFlags.SplitInverse):
         image = splitRight(image)
 
+    # Auto crop the image, but before manage size and co, clean the source so
+    if flags & ImageFlags.AutoCrop:
+        image = autoCropImage(image)
+
     if flags & ImageFlags.Orient:
         image = orientImage(image, size)
     if flags & ImageFlags.Resize:
@@ -265,7 +281,10 @@ def convertImage(source, target, device, flags):
         image = stretchImage(image, size)
     if flags & ImageFlags.Frame:
         image = frameImage(image, tuple(palette[:3]), tuple(palette[-3:]), size)
+
+
+
     if flags & ImageFlags.Quantize:
         image = quantizeImage(image, palette)
-
-    saveImage(image, target)
+    
+    saveImage(image, target)
\ No newline at end of file
diff --git a/mangle/options.py b/mangle/options.py
index 19d6929..08a29dd 100644
--- a/mangle/options.py
+++ b/mangle/options.py
@@ -72,6 +72,8 @@ class DialogOptions(QtGui.QDialog):
             imageFlags |= ImageFlags.Split
         if self.checkboxSplitInverse.isChecked():
             imageFlags |= ImageFlags.SplitInverse
+        if self.checkboxAutoCrop.isChecked():
+            imageFlags |= ImageFlags.AutoCrop
 
         # If we did modified a value, update the book
         # and only if we did change something to not
diff --git a/mangle/ui/options.ui b/mangle/ui/options.ui
index 65df9bf..3619bbb 100644
--- a/mangle/ui/options.ui
+++ b/mangle/ui/options.ui
@@ -181,14 +181,21 @@
         </property>
        </widget>
       </item>
-       <item>
+      <item>
        <widget class="QCheckBox" name="checkboxSplitInverse">
         <property name="text">
          <string>Split images into two pages (left, right)</string>
         </property>
        </widget>
       </item>
-        <item>
+      <item>
+       <widget class="QCheckBox" name="checkboxAutoCrop">
+        <property name="text">
+         <string>Auto crop image (remove white around the image)</string>
+        </property>
+       </widget>
+      </item>
+      <item>
          <widget class="QLabel" name="label_3">
           <property name="text">
            <string>Size</string>