diff --git a/CHANGELOG.rst b/CHANGELOG.rst
index 801d8a6..295a2bb 100644
--- a/CHANGELOG.rst
+++ b/CHANGELOG.rst
@@ -1,9 +1,12 @@
 Release History
 ===============
 
-0.8 (not yet released)
-----------------------
+0.8 (2017-05-06)
+----------------
 * updated command line. All commands are now prefixed with *stegano-*;
+* improved type hints;
+* it is possible to load and save images from and to file objects (BytesIO);
+* improved checks when revealing a message with the lsbset module fails.
 
 0.7.1 (2017-05-05)
 ------------------
diff --git a/docs/conf.py b/docs/conf.py
index 17d73d8..33cd492 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -48,9 +48,9 @@ copyright = u'2012-2017, Cédric Bonhomme'
 # built documents.
 #
 # The short X.Y version.
-version = '0.7'
+version = '0.8'
 # The full version, including alpha/beta/rc tags.
-release = '0.7.1'
+release = '0.8'
 
 # The language for content autogenerated by Sphinx. Refer to documentation
 # for a list of supported languages.
diff --git a/setup.py b/setup.py
index 2e1dce1..c9ce7df 100644
--- a/setup.py
+++ b/setup.py
@@ -36,7 +36,7 @@ with open('CHANGELOG.rst', 'r') as f:
 
 setup(
     name='Stegano',
-    version='0.7.1',
+    version='0.8',
     author='Cédric Bonhomme',
     author_email='cedric@cedricbonhomme.org',
     packages=packages,
diff --git a/stegano/lsb/lsb.py b/stegano/lsb/lsb.py
index 2e5a3de..b952329 100755
--- a/stegano/lsb/lsb.py
+++ b/stegano/lsb/lsb.py
@@ -28,12 +28,13 @@ __license__ = "GPLv3"
 import sys
 
 from PIL import Image
+from typing import Union, IO
 
 from stegano import tools
 
-def hide(input_image_file: str,
-        message,
-        encoding='UTF-8',
+def hide(input_image: Union[str, IO[bytes]],
+        message: str,
+        encoding: str = 'UTF-8',
         auto_convert_rgb: bool = False):
     """Hide a message (string) in an image with the
     LSB (Least Significant Bit) technique.
@@ -41,7 +42,7 @@ def hide(input_image_file: str,
     message_length = len(message)
     assert message_length != 0, "message length is zero"
 
-    img = Image.open(input_image_file)
+    img = Image.open(input_image)
 
     if img.mode not in ['RGB', 'RGBA']:
         if not auto_convert_rgb:
@@ -92,10 +93,10 @@ def hide(input_image_file: str,
                 return encoded
 
 
-def reveal(input_image_file, encoding='UTF-8'):
+def reveal(input_image: Union[str, IO[bytes]], encoding='UTF-8'):
     """Find a message in an image (with the LSB technique).
     """
-    img = Image.open(input_image_file)
+    img = Image.open(input_image)
     width, height = img.size
     buff, count = 0, 0
     bitab = []
diff --git a/stegano/lsbset/lsbset.py b/stegano/lsbset/lsbset.py
index 9ebdc9b..d76697a 100644
--- a/stegano/lsbset/lsbset.py
+++ b/stegano/lsbset/lsbset.py
@@ -28,22 +28,23 @@ __license__ = "GPLv3"
 import sys
 
 from PIL import Image
+from typing import Union, Iterator, IO
 
 from stegano import tools
 from . import generators
 
-def hide(input_image_file,
-        message,
-        generator,
-        encoding='UTF-8',
-        auto_convert_rgb=False):
+def hide(input_image: Union[str, IO[bytes]],
+        message: str,
+        generator: Iterator[int],
+        encoding: str = 'UTF-8',
+        auto_convert_rgb: bool = False):
     """Hide a message (string) in an image with the
     LSB (Least Significant Bit) technique.
     """
     message_length = len(message)
     assert message_length != 0, "message length is zero"
 
-    img = Image.open(input_image_file)
+    img = Image.open(input_image)
 
     if img.mode not in ['RGB', 'RGBA']:
         if not auto_convert_rgb:
@@ -94,10 +95,12 @@ def hide(input_image_file,
     return encoded
 
 
-def reveal(input_image_file, generator, encoding='UTF-8'):
+def reveal(input_image: Union[str, IO[bytes]],
+            generator: Iterator[int],
+            encoding: str = 'UTF-8'):
     """Find a message in an image (with the LSB technique).
     """
-    img = Image.open(input_image_file)
+    img = Image.open(input_image)
     img_list = list(img.getdata())
     width, height = img.size
     buff, count = 0, 0
@@ -114,9 +117,9 @@ def reveal(input_image_file, generator, encoding='UTF-8'):
                 bitab.append(chr(buff))
                 buff, count = 0, 0
                 if bitab[-1] == ":" and limit == None:
-                    try:
+                    if "".join(bitab[:-1]).isdigit():
                         limit = int("".join(bitab[:-1]))
-                    except:
-                        pass
+                    else:
+                        raise IndexError("Impossible to detect message.")
         if len(bitab)-len(str(limit))-1 == limit :
             return "".join(bitab)[len(str(limit))+1:]
diff --git a/stegano/red/red.py b/stegano/red/red.py
index f75b5ad..a871e4d 100755
--- a/stegano/red/red.py
+++ b/stegano/red/red.py
@@ -28,8 +28,9 @@ __license__ = "GPLv3"
 import sys
 
 from PIL import Image
+from typing import Union, IO
 
-def hide(input_image_file, message):
+def hide(input_image: Union[str, IO[bytes]], message: str):
     """
     Hide a message (string) in an image.
 
@@ -40,7 +41,7 @@ def hide(input_image_file, message):
     message_length = len(message)
     assert message_length != 0, "message message_length is zero"
     assert message_length < 255, "message is too long"
-    img = Image.open(input_image_file)
+    img = Image.open(input_image)
     # Use a copy of image to hide the text in
     encoded = img.copy()
     width, height = img.size
@@ -61,7 +62,7 @@ def hide(input_image_file, message):
     img.close()
     return encoded
 
-def reveal(input_image_file):
+def reveal(input_image: Union[str, IO[bytes]]):
     """
     Find a message in an image.
 
@@ -69,7 +70,7 @@ def reveal(input_image_file):
     hidden message characters (ASCII values).
     The red value of the first pixel is used for message_length of string.
     """
-    img = Image.open(input_image_file)
+    img = Image.open(input_image)
     width, height = img.size
     message = ""
     index = 0