Update

app.py

@@ -43,7 +43,8 @@ def process_XDoG(image_path):
 def replace_color(image, color_1, blur_radius=2):
     data = np.array(image)
     original_shape = data.shape
-    data = data.reshape(-1, 4)
+    channels = original_shape[2] if len(original_shape) > 2 else 1  # チャンネル数を確認
+    data = data.reshape(-1, channels)
     color_1 = np.array(color_1)
     matches = np.all(data[:, :3] == color_1, axis=1)
     nochange_count = 0