diff --git a/rpi/blinkingTest.py b/rpi/blinkingTest.py
index 5b0beeb..9e18a0d 100644
--- a/rpi/blinkingTest.py
+++ b/rpi/blinkingTest.py
@@ -23,7 +23,7 @@ def pure_pil_alpha_to_color_v2(image, color=(0, 0, 0)):
 
 def image_interpolation(image1, image2, alpha):
     # Ensure both images have the same size
-    assert image1.shape == image2.shape, "Input images must have the same shape"
+    assert image1.size == image2.size, "Input images must have the same shape"
 
     # Normalize the alpha value
     alpha = max(0, min(1, alpha))