diff --git a/resources/default_tweaks.py b/resources/default_tweaks.py
index 98cdccf164..48845da920 100644
--- a/resources/default_tweaks.py
+++ b/resources/default_tweaks.py
@@ -88,8 +88,9 @@ save_template_title_series_sorting = 'library_order'
 # separated by 'or' bars. Comparisons are case insensitive, and that cannot be
 # changed. Changes to this tweak won't have an effect until the book is modified
 # in some way. If you enter an invalid pattern, it is silently ignored.
+# To disable use the expression: '^$'
 # Default: '^(A|The|An)\s+'
-title_sort_articles='^(A|The|An)\s+'
+title_sort_articles=r'^(A|The|An)\s+'
 
 
 # Specify a folder that calibre should connect to at startup using
diff --git a/resources/recipes/rmf24_opinie.recipe b/resources/recipes/rmf24_opinie.recipe
index 4d2f447dbe..9e4d336252 100644
--- a/resources/recipes/rmf24_opinie.recipe
+++ b/resources/recipes/rmf24_opinie.recipe
@@ -42,7 +42,7 @@ class RMF24_opinie(BasicNewsRecipe):
     # thanks to Kovid Goyal
     def get_article_url(self, article):
         link = article.get('link')
-        if 'audio' not in link:
+        if '/audio,aId' not in link:
             return link
 
     preprocess_regexps = [
diff --git a/src/calibre/ebooks/mobi/output.py b/src/calibre/ebooks/mobi/output.py
index d82704a0df..49da18ea7b 100644
--- a/src/calibre/ebooks/mobi/output.py
+++ b/src/calibre/ebooks/mobi/output.py
@@ -41,24 +41,6 @@ class MOBIOutput(OutputFormatPlugin):
         ),
     ])
 
-    def remove_image_transparencies(self):
-        from calibre.utils.magick.draw import save_cover_data_to
-        for item in self.oeb.manifest:
-            if item.media_type.startswith('image'):
-                raw = item.data
-                ext = item.media_type.split('/')[-1].lower()
-                if ext not in ('png', 'gif') or not raw:
-                    continue
-                try:
-                    data = save_cover_data_to(raw, 'img.'+ext, return_data=True)
-                except:
-                    self.log.exception('Failed to remove transparency from',
-                            item.href)
-                    data = None
-                if data is not None:
-                    item.data = data
-                    item.unload_data_from_memory()
-
     def check_for_periodical(self):
         if self.oeb.metadata.publication_type and \
             unicode(self.oeb.metadata.publication_type[0]).startswith('periodical:'):
@@ -178,7 +160,6 @@ class MOBIOutput(OutputFormatPlugin):
         from calibre.ebooks.oeb.transforms.rasterize import SVGRasterizer, Unavailable
         from calibre.ebooks.oeb.transforms.htmltoc import HTMLTOCAdder
         from calibre.customize.ui import plugin_for_input_format
-        self.remove_image_transparencies()
         imagemax = PALM_MAX_IMAGE_SIZE if opts.rescale_images else None
         if not opts.no_inline_toc:
             tocadder = HTMLTOCAdder(title=opts.toc_title)
diff --git a/src/calibre/ebooks/mobi/writer.py b/src/calibre/ebooks/mobi/writer.py
index 51639ac757..e8fc4557fd 100644
--- a/src/calibre/ebooks/mobi/writer.py
+++ b/src/calibre/ebooks/mobi/writer.py
@@ -15,7 +15,6 @@ from struct import pack
 import time
 from urlparse import urldefrag
 
-from PIL import Image
 from cStringIO import StringIO
 from calibre.ebooks.mobi.langcodes import iana2mobi
 from calibre.ebooks.mobi.mobiml import MBP_NS
@@ -28,6 +27,7 @@ from calibre.ebooks.oeb.base import namespace
 from calibre.ebooks.oeb.base import prefixname
 from calibre.ebooks.oeb.base import urlnormalize
 from calibre.ebooks.compression.palmdoc import compress_doc
+from calibre.utils.magick.draw import Image, save_cover_data_to, thumbnail
 
 INDEXING = True
 FCIS_FLIS = True
@@ -111,46 +111,18 @@ def align_block(raw, multiple=4, pad='\0'):
     return raw + pad*(multiple - extra)
 
 def rescale_image(data, maxsizeb, dimen=None):
-    image = Image.open(StringIO(data))
-    format = image.format
-    changed = False
-    if image.format not in ('JPEG', 'GIF'):
-        width, height = image.size
-        area = width * height
-        if area <= 40000:
-            format = 'GIF'
-        else:
-            image = image.convert('RGBA')
-            format = 'JPEG'
-        changed = True
     if dimen is not None:
-        image.thumbnail(dimen, Image.ANTIALIAS)
-        changed = True
-    if changed:
-        data = StringIO()
-        image.save(data, format)
-        data = data.getvalue()
-    if len(data) <= maxsizeb:
-        return data
-    image = image.convert('RGBA')
-    for quality in xrange(95, -1, -1):
-        data = StringIO()
-        image.save(data, 'JPEG', quality=quality)
-        data = data.getvalue()
-        if len(data) <= maxsizeb:
-            return data
-    width, height = image.size
-    for scale in xrange(99, 0, -1):
-        scale = scale / 100.
-        data = StringIO()
-        scaled = image.copy()
-        size = (int(width * scale), (height * scale))
-        scaled.thumbnail(size, Image.ANTIALIAS)
-        scaled.save(data, 'JPEG', quality=0)
-        data = data.getvalue()
-        if len(data) <= maxsizeb:
-            return data
-    # Well, we tried?
+        return thumbnail(data, width=dimen, height=dimen)[-1]
+    # Replace transparent pixels with white pixels and convert to JPEG
+    data = save_cover_data_to(data, 'img.jpg', return_data=True)
+    scale = 0.9
+    while len(data) >= maxsizeb and scale >= 0.05:
+        img = Image()
+        img.load(data)
+        w, h = img.size
+        img.size = (int(scale*w), int(scale*h))
+        data = img.export('jpg')
+        scale -= 0.05
     return data
 
 class Serializer(object):