diff -r 18da24db44b6 -r 8654d1faa27d src/pyams_content/component/gallery/zmi/templates/gallery-images.pt
--- a/src/pyams_content/component/gallery/zmi/templates/gallery-images.pt	Fri Dec 08 10:47:40 2017 +0100
+++ b/src/pyams_content/component/gallery/zmi/templates/gallery-images.pt	Fri Dec 08 10:48:16 2017 +0100
@@ -9,6 +9,11 @@
 			tal:attributes="data-ams-switcher-state 'open' if context.values() else None">
 			<i18n:var translate="">Gallery images</i18n:var>
 		</legend>
+		<div class="btn-group pull-right">
+			<a class="btn btn-xs btn-primary"
+			   tal:attributes="href extension:absolute_url(context, 'get-images.zip')"
+			   i18n:translate="">Download images</a>
+		</div>
 		<div class="pull-left persistent">
 			<tal:var content="structure provider:pyams.widget_title" />
 		</div>
@@ -31,13 +36,13 @@
 						<a class="fancyimg hint" data-toggle
 						   data-ams-hint-gravity="sw"
 						   title="Zoom image" i18n:attributes="title"
-						   tal:define="target thumbnails.get_thumbnail('800x600', 'jpeg')"
+						   tal:define="target thumbnails.get_thumbnail('800x600')"
 						   tal:attributes="class 'fancyimg hint {0}'.format('not-visible' if not image.visible else '');
 										   href extension:absolute_url(target);
 										   rel string:gallery_${context.__name__};">
 							<img class="thumbnail"
 								 data-ams-hint-gravity="s"
-								 tal:define="thumbnail thumbnails.get_thumbnail('128x128', 'jpeg');
+								 tal:define="thumbnail thumbnails.get_thumbnail('128x128');
 											 image_size thumbnail.get_image_size();
 											 margin_left 64 - image_size[0] / 2;
 											 margin_top 64 - image_size[1] / 2;