diff --git a/src/textual_paint/canvas.py b/src/textual_paint/canvas.py
index 39fb88b..6ed2791 100644
--- a/src/textual_paint/canvas.py
+++ b/src/textual_paint/canvas.py
@@ -215,12 +215,12 @@ class Canvas(Widget):
             cell_y = y // magnification
             try:
                 if sel and sel.contained_image and sel.region.contains(cell_x, cell_y) and (sel.mask is None or sel.mask[cell_y - sel.region.y][cell_x - sel.region.x]):
-                    # bg = sel.contained_image.bg[cell_y - sel.region.y][cell_x - sel.region.x]
+                    bg = sel.contained_image.bg[cell_y - sel.region.y][cell_x - sel.region.x]
                     # fg = sel.contained_image.fg[cell_y - sel.region.y][cell_x - sel.region.x]
                     ch = sel.contained_image.ch[cell_y - sel.region.y][cell_x - sel.region.x]
                     style = sel.contained_image.sc[cell_y - sel.region.y][cell_x - sel.region.x]
                 else:
-                    # bg = self.image.bg[cell_y][cell_x]
+                    bg = self.image.bg[cell_y][cell_x]
                     # fg = self.image.fg[cell_y][cell_x]
                     ch = self.image.ch[cell_y][cell_x]
                     style = self.image.sc[cell_y][cell_x]