diff --git a/test/percy/plotly-express.py b/test/percy/plotly-express.py
index 0342f333940..9d8615262af 100644
--- a/test/percy/plotly-express.py
+++ b/test/percy/plotly-express.py
@@ -341,6 +341,16 @@
 )
 fig.write_html(os.path.join(dir_name, "line_ternary.html"))
 
+import plotly.express as px
+import numpy as np
+
+img_rgb = np.array(
+    [[[255, 0, 0], [0, 255, 0], [0, 0, 255]], [[0, 255, 0], [0, 0, 255], [255, 0, 0]]],
+    dtype=np.uint8,
+)
+fig = px.imshow(img_rgb)
+fig.write_html(os.path.join(dir_name, "imshow.html"))
+
 # #### 3D Coordinates
 
 import plotly.express as px