diff --git a/AUTHORS b/AUTHORS
index 215c7da..d8ed820 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -5,6 +5,7 @@ alphabetical order):
 - Andreas Sieferlinger
 - Antoine Pitrou
 - Christophe-Marie Duquesne
+- @franek (François D.)
 - Giel van Schijndel
 - Jamie Starke
 - @jdn06
diff --git a/sigal/gallery.py b/sigal/gallery.py
index 9eef6c8..507732c 100644
--- a/sigal/gallery.py
+++ b/sigal/gallery.py
@@ -3,6 +3,7 @@
 # Copyright (c) 2009-2014 - Simon Conseil
 # Copyright (c) 2013      - Christophe-Marie Duquesne
 # Copyright (c) 2014      - Jonas Kaufmann
+# Copyright (c) 2015      - François D.
 
 # Permission is hereby granted, free of charge, to any person obtaining a copy
 # of this software and associated documentation files (the "Software"), to
@@ -41,7 +42,7 @@ from PIL import Image as PILImage
 
 from . import image, video, signals
 from .compat import PY2, UnicodeMixin, strxfrm, url_quote, text_type
-from .image import process_image, get_exif_tags, get_exif_data
+from .image import process_image, get_exif_tags, get_exif_data, get_size
 from .settings import get_thumb
 from .utils import (Devnull, copy, check_or_create_dir, url_from_path,
                     read_markdown, cached_property, is_valid_html5_video,
@@ -168,6 +169,14 @@ class Image(Media):
                                 self.src_path)
             return None
 
+    @cached_property
+    def size(self):
+        return get_size(self.dst_path)
+
+    @cached_property
+    def thumb_size(self):
+        return get_size(self.thumb_path)
+
 
 class Video(Media):
     """Gather all informations on a video file."""
@@ -370,17 +379,18 @@ class Album(UnicodeMixin):
             for f in self.medias:
                 ext = splitext(f.filename)[1]
                 if ext.lower() in Image.extensions:
-                    try:
-                        im = PILImage.open(f.src_path)
-                    except:
-                        self.logger.error("Failed to open %s", f.src_path)
-                    else:
-                        if im.size[0] > im.size[1]:
-                            self._thumbnail = join(self.name, f.thumbnail)
-                            self.logger.debug(
-                                "Use 1st landscape image as thumbnail for %r :"
-                                " %s", self, self._thumbnail)
-                            return url_from_path(self._thumbnail)
+                    # Use f.size if available as it is quicker (in cache), but
+                    # fallback to the size of src_path if dst_path is missing
+                    size = f.size
+                    if size is None:
+                        size = get_size(f.src_path)
+
+                    if size['width'] > size['height']:
+                        self._thumbnail = join(self.name, f.thumbnail)
+                        self.logger.debug(
+                            "Use 1st landscape image as thumbnail for %r :"
+                            " %s", self, self._thumbnail)
+                        return url_from_path(self._thumbnail)
 
             # else simply return the 1st media file
             if not self._thumbnail and self.medias:
diff --git a/sigal/image.py b/sigal/image.py
index 0450ded..d77ff08 100644
--- a/sigal/image.py
+++ b/sigal/image.py
@@ -1,6 +1,7 @@
 # -*- coding:utf-8 -*-
 
 # Copyright (c) 2009-2014 - Simon Conseil
+# Copyright (c) 2015 - François D.
 
 # Permission is hereby granted, free of charge, to any person obtaining a copy
 # of this software and associated documentation files (the "Software"), to
@@ -151,8 +152,8 @@ def process_image(filepath, outpath, settings):
         if settings['make_thumbs']:
             thumb_name = os.path.join(outpath, get_thumb(settings, filename))
             generate_thumbnail(outname, thumb_name, settings['thumb_size'],
-                settings['thumb_video_delay'], fit=settings['thumb_fit'],
-                options=options)
+                               settings['thumb_video_delay'],
+                               fit=settings['thumb_fit'], options=options)
     except Exception as e:
         logger.info('Failed to process: %r', e)
         return Status.FAILURE
@@ -160,6 +161,21 @@ def process_image(filepath, outpath, settings):
     return Status.SUCCESS
 
 
+def get_size(file_path):
+    """Return image size (width and height)."""
+    try:
+        im = PILImage.open(file_path)
+    except (IOError, IndexError, TypeError, AttributeError) as e:
+        logger = logging.getLogger(__name__)
+        logger.error("Could not read size of %s due to %r", file_path, e)
+    else:
+        width, height = im.size
+        return {
+            'width': width,
+            'height': height
+        }
+
+
 def get_exif_data(filename):
     """Return a dict with the raw EXIF data."""
 
diff --git a/tests/test_image.py b/tests/test_image.py
index b6c27b2..638ac26 100644
--- a/tests/test_image.py
+++ b/tests/test_image.py
@@ -6,7 +6,7 @@ from PIL import Image
 
 from sigal import init_logging
 from sigal.image import (generate_image, generate_thumbnail, get_exif_tags,
-                         get_exif_data)
+                         get_exif_data, get_size)
 from sigal.settings import create_settings
 
 CURRENT_DIR = os.path.dirname(__file__)
@@ -115,3 +115,22 @@ def test_exif_gps(tmpdir):
 
     assert abs(simple['gps']['lat'] - lat) < 0.0001
     assert abs(simple['gps']['lon'] - lon) < 0.0001
+
+def test_get_size(tmpdir):
+    """Test reading out image size"""
+
+    test_image = 'flickr_jerquiaga_2394751088_cc-by-nc.jpg'
+    src_file = os.path.join(CURRENT_DIR, 'sample', 'pictures', 'dir1', 'test1',
+                            test_image)
+
+    result = get_size(src_file)
+    assert result == {'height': 800, 'width': 600}
+
+def test_get_size_with_invalid_path(tmpdir):
+    """Test reading out image size with a missing file"""
+
+    test_image = 'missing-file.jpg'
+    src_file = os.path.join(CURRENT_DIR, test_image)
+
+    result = get_size(src_file)
+    assert result == None
\ No newline at end of file