diff --git a/utils.py b/utils.py
index b3be461..d5c70db 100644
--- a/utils.py
+++ b/utils.py
@@ -34,7 +34,7 @@ def extract_colors():
     return rgb_tensor, xkcd_color_names
 
 
-PURE_RGB = preprocess_data(torch.eye(3) + torch.eye(3)[:, [1, 2, 0]])
+PURE_RGB = preprocess_data(torch.cat([torch.eye(3), torch.eye(3) + torch.eye(3)[:, [1, 2, 0]]], dim=0))
 PURE_HSV = torch.tensor(
     [[0], [1 / 3], [2 / 3], [5 / 6], [1 / 6], [0.5]], dtype=torch.float32
 )