diff --git a/photos.php b/photos.php
index f2ec180..b9086dc 100644
--- a/photos.php
+++ b/photos.php
@@ -70,7 +70,7 @@ function getPhotos($dir)
         $path = realpath($dir.DIRECTORY_SEPARATOR.$value);
         if (!is_dir($path)) {
             $ext = pathinfo($path, PATHINFO_EXTENSION);
-            if ($ext == "bmp" || $ext == "jpg" || $ext == "jpeg" || $ext == "png" || $ext == "gif") {
+            if ($ext == "jpg" || $ext == "jpeg" || $ext == "png") {
                 $imageSrc = $dir.DIRECTORY_SEPARATOR.$value;
                 $imageId = "photo-".$displayedItems;
                 include("includes/photos/photo_template.php");
diff --git a/photos/compress_photos.py b/photos/compress_photos.py
index ed34638..2ff4a90 100644
--- a/photos/compress_photos.py
+++ b/photos/compress_photos.py
@@ -15,9 +15,9 @@ def get_images(path):
     """
     file_list = []
     for root, dirs, files in os.walk(path):
-        if is_directory_valid(root, len(files)):
+        if is_directory_valid(root, files):
                 for fn in files:
-                    if fn.endswith("png") or fn.endswith("jpg") or fn.endswith("bmp"):
+                    if is_file_valid_image(fn):
                         file_list.append(os.path.join(root, fn))
     return file_list
 
@@ -59,7 +59,8 @@ def compress_images(images):
                 sys.exit("Fatal : Directory '" + os.path.dirname(filename) + "' does not exist and cannot be created")
 
         img.save(filename, "JPEG")
-    print("Done. Thumbnails saved in 'photos_thumb' directory")
+    print("done")
+    print("Thumbnails saved in 'photos_thumb' directory")
 
 
 def get_new_path(img):
@@ -73,18 +74,18 @@ def get_new_path(img):
 
 def zip_dir(path):
     """
-    Compress files in the specified directory and sub-directories
+    Compress images in the specified directory and sub-directories
     Create one zip per folder
 
     :param path: directory to get files in
     :return:
     """
     for root, dirs, files in os.walk(path):
-        if is_directory_valid(root, len(files)):
+        if is_directory_valid(root, files):
             print("Compressing '" + root + "'", end="")
             with ZipFile(os.path.join(root, get_current_dir(root)) + ".zip", "w", ZIP_DEFLATED) as zip_file:
                 for fn in files:
-                    if not fn.endswith("zip"):
+                    if not fn.endswith("zip") and is_file_valid_image(fn):
                         print(".", end="")
                         absolute_file_name = os.path.join(root, fn)
                         zippped_file_name = absolute_file_name[len(root)+len(os.sep):]  # XXX: relative path
@@ -93,22 +94,32 @@ def zip_dir(path):
     print("COMPRESSION FINISHED")
 
 
-def is_directory_valid(path, files_number):
+def is_directory_valid(path, files):
     """
-    Check if the given path is not hidden or empty
-    :param files_number: number of files in the folder
+    Check if the given path is not hidden or without images
+    :param files:  files in the folder
     :param path: Path to check
     :return: True if path contains a hidden folder or is empty, False otherwise
     """
     directories = path.split(os.sep)
-    valid = files_number > 0
-    for dn in directories:
+    valid = len(files) > 0
+    for dn in directories:  # check if directory or one of its parent are not hidden
         if dn.startswith(".") or not valid:
             valid = False
             break
+    if valid:
+        valid_files = []
+        for fn in files:  # check if directory contains valid images
+            if is_file_valid_image(fn):
+                valid_files.append(fn)
+        valid = len(valid_files) > 0
     return valid
 
 
+def is_file_valid_image(file):
+    return file.endswith("png") or file.endswith("jpg") or file.endswith("jpeg")
+
+
 def get_current_dir(path):
     """
     Get the name of the current directory
@@ -126,7 +137,7 @@ def get_confirmation(path):
     """
     print("The following folders will be compressed (hidden and empty folders are ignored):")
     for root, dirs, files in os.walk(path):
-        if is_directory_valid(root, len(files)):
+        if is_directory_valid(root, files):
             print(root)
     confirmation = input("Are you sure you want to proceed? [Y/n]")
     return confirmation == "Y" or confirmation == "y"