diff --git a/src/calibre/gui2/icon_theme.py b/src/calibre/gui2/icon_theme.py
index aa7924bd89..1f40c93e14 100644
--- a/src/calibre/gui2/icon_theme.py
+++ b/src/calibre/gui2/icon_theme.py
@@ -497,7 +497,7 @@ class Delegate(QStyledItemDelegate):
         pixmap = index.data(Qt.DecorationRole)
         if pixmap and not pixmap.isNull():
             rect = option.rect.adjusted(0, self.SPACING, COVER_SIZE[0] - option.rect.width(), - self.SPACING)
-            painter.drawPixmap(rect, pixmap, pixmap.rect())
+            painter.drawPixmap(rect, pixmap)
         if option.state & QStyle.State_Selected:
             painter.setPen(QPen(QApplication.instance().palette().highlightedText().color()))
         bottom = option.rect.bottom() - 2
@@ -690,6 +690,7 @@ class ChooseTheme(Dialog):
         theme['cover-pixmap'] = p = QPixmap()
         if isinstance(cdata, bytes):
             p.loadFromData(cdata)
+            p.setDevicePixelRatio(self.devicePixelRatio())
         item = self.item_from_name(theme['name'])
         if item is not None:
             item.setData(Qt.DecorationRole, p)
diff --git a/src/calibre/gui2/preferences/look_feel.py b/src/calibre/gui2/preferences/look_feel.py
index 378b5993b2..b95b02c57e 100644
--- a/src/calibre/gui2/preferences/look_feel.py
+++ b/src/calibre/gui2/preferences/look_feel.py
@@ -239,7 +239,9 @@ class Background(QWidget):  # {{{
             from calibre.gui2.preferences.texture_chooser import texture_path
             path = texture_path(self.btex)
             if path:
-                self.brush.setTexture(QPixmap(path))
+                p = QPixmap(path)
+                p.setDevicePixelRatio(self.devicePixelRatio())
+                self.brush.setTexture(p)
         self.update()
 
     def sizeHint(self):