Update app.py

app.py

@@ -34,6 +34,6 @@ canvas_result = st_canvas(
 # Do something interesting with the image data and paths
 if canvas_result.image_data is not None:
     st.image(canvas_result.image_data)
-    img=cv2.cvtColor(canvas_result.image_data,cv2.COLOR_RGBA2BGR)
+    img=cv2.cvtColor(canvas_result.image_data,cv2.COLOR_RGBA2GRAY)
     st.write(type(img))
     st.write(img.shape)