style = {}
                     if iw > ih :
                         style['width'] = PICTURE_ITEM_SIZE
-                        style['height'] = PICTURE_ITEM_SIZE * float(ih) / iw
+                        style['height'] = int(round(PICTURE_ITEM_SIZE * float(ih) / iw))
                     else :
                         style['heigth'] = PICTURE_ITEM_SIZE
-                        style['width'] = PICTURE_ITEM_SIZE * float(iw) / ih
+                        style['width'] = int(round(PICTURE_ITEM_SIZE * float(iw) / ih))
                         
                     img = basic.Image(img, style=style)
                 else :