diff --git a/src/calibre/ebooks/metadata/sources/covers.py b/src/calibre/ebooks/metadata/sources/covers.py
index 89326a2d11..6a401dae60 100644
--- a/src/calibre/ebooks/metadata/sources/covers.py
+++ b/src/calibre/ebooks/metadata/sources/covers.py
@@ -15,7 +15,8 @@ from io import BytesIO
 from calibre.customize.ui import metadata_plugins
 from calibre.ebooks.metadata.sources.base import create_log
 from calibre.ebooks.metadata.sources.prefs import msprefs
-from calibre.utils.magick.draw import Image, save_cover_data_to
+from calibre.utils.img import save_cover_data_to
+from calibre.utils.imghdr import identify
 
 class Worker(Thread):
 
@@ -59,17 +60,19 @@ def is_worker_alive(workers):
 def process_result(log, result):
     plugin, data = result
     try:
-        im = Image()
-        im.load(data)
         if getattr(plugin, 'auto_trim_covers', False):
+            from calibre.utils.magick import Image
+            im = Image()
+            im.load(data)
             im.trim(10)
-        width, height = im.size
-        fmt = im.format
-
+            data = im.export('JPEG')
+        fmt, width, height = identify(data)
+        if width < 0 or height < 0:
+            raise ValueError('Could not read cover image dimensions')
         if width < 50 or height < 50:
             raise ValueError('Image too small')
-        data = save_cover_data_to(im, '/cover.jpg', return_data=True)
-    except:
+        data = save_cover_data_to(data)
+    except Exception:
         log.exception('Invalid cover from', plugin.name)
         return None
     return (plugin, width, height, fmt, data)