--- a/src/pyams_content/component/gallery/__init__.py	Fri Sep 14 14:25:28 2018 +0200
+++ b/src/pyams_content/component/gallery/__init__.py	Mon Sep 17 17:37:46 2018 +0200
@@ -15,35 +15,34 @@
 
 # import standard library
 
-# import interfaces
-from pyams_content.component.gallery.interfaces import IBaseGallery, IGallery, IGalleryTarget, \
-    GALLERY_CONTAINER_KEY, GALLERY_RENDERERS
-from pyams_content.component.paragraph import IBaseParagraph
-from pyams_content.features.checker.interfaces import IContentChecker
-from pyams_content.shared.common.interfaces import IWfSharedContent
-from pyams_form.interfaces.form import IFormContextPermissionChecker
-from pyams_i18n.interfaces import II18n
+from pyramid.events import subscriber
+from pyramid.threadlocal import get_current_registry
+from zope.interface import implementer
+from zope.lifecycleevent import ObjectModifiedEvent
 from zope.lifecycleevent.interfaces import IObjectAddedEvent, IObjectModifiedEvent, IObjectRemovedEvent
+from zope.location import locate
 from zope.location.interfaces import ISublocations
+from zope.schema.fieldproperty import FieldProperty
 from zope.traversing.interfaces import ITraversable
 
 # import packages
 from pyams_catalog.utils import index_object
+from pyams_content import _
+# import interfaces
+from pyams_content.component.gallery.interfaces import IBaseGallery, IGallery, IGalleryTarget, IGalleryFile, \
+    GALLERY_CONTAINER_KEY, GALLERY_RENDERERS
+from pyams_content.component.paragraph import IBaseParagraph
 from pyams_content.features.checker import BaseContentChecker
+from pyams_content.features.checker.interfaces import IContentChecker
 from pyams_content.features.renderer import RenderedContentMixin, RenderersVocabulary
+from pyams_content.shared.common.interfaces import IWfSharedContent
+from pyams_form.interfaces.form import IFormContextPermissionChecker
+from pyams_i18n.interfaces import II18n
 from pyams_utils.adapter import adapter_config, ContextAdapter, get_annotation_adapter
+from pyams_utils.container import BTreeOrderedContainer
 from pyams_utils.factory import factory_config
-from pyams_utils.container import BTreeOrderedContainer
 from pyams_utils.traversing import get_parent
 from pyams_utils.vocabulary import vocabulary_config
-from pyramid.events import subscriber
-from pyramid.threadlocal import get_current_registry
-from zope.interface import implementer
-from zope.lifecycleevent import ObjectCreatedEvent, ObjectModifiedEvent
-from zope.location import locate
-from zope.schema.fieldproperty import FieldProperty
-
-from pyams_content import _
 
 
 #
@@ -73,7 +72,7 @@
             index_object(value)
 
     def get_visible_medias(self):
-        return [media for media in self.values() if media.visible]
+        yield from filter(lambda x: IGalleryFile(x).visible, self.values())
 
 
 @adapter_config(context=IGalleryTarget, provides=IGallery)