show antialiased icons

gui/qt/installwizard.py

@@ -290,7 +290,8 @@ class InstallWizard(QDialog, MessageBoxMixin, BaseWizard):
 
     def set_icon(self, filename):
         prior_filename, self.icon_filename = self.icon_filename, filename
-        self.logo.setPixmap(QPixmap(filename).scaledToWidth(60))
+        self.logo.setPixmap(QPixmap(filename)
+                                .scaledToWidth(64, Qt.SmoothTransformation))
         return prior_filename
 
     def set_layout(self, layout, title=None, next_enabled=True):

gui/qt/password_dialog.py

@@ -103,7 +103,8 @@ class PasswordLayout(object):
                 lockfile = ":icons/lock.png"
             else:
                 lockfile = ":icons/unlock.png"
-            logo.setPixmap(QPixmap(lockfile).scaledToWidth(36))
+            logo.setPixmap(QPixmap(lockfile)
+                               .scaledToWidth(36, Qt.SmoothTransformation))
 
         grid.addWidget(QLabel(msgs[0]), 1, 0)
         grid.addWidget(self.new_pw, 1, 1)

gui/qt/seed_dialog.py

@@ -105,7 +105,8 @@ class SeedLayout(QVBoxLayout):
         hbox = QHBoxLayout()
         if icon:
             logo = QLabel()
-            logo.setPixmap(QPixmap(":icons/seed.png").scaledToWidth(64))
+            logo.setPixmap(QPixmap(":icons/seed.png")
+                               .scaledToWidth(64, Qt.SmoothTransformation))
             logo.setMaximumWidth(60)
             hbox.addWidget(logo)
         hbox.addWidget(self.seed_e)