diff --git a/01-Introduction-and-Installation/cv2_read_image_time.py b/01-Introduction-and-Installation/cv2_read_image_time.py
index c76074a..3ea201f 100644
--- a/01-Introduction-and-Installation/cv2_read_image_time.py
+++ b/01-Introduction-and-Installation/cv2_read_image_time.py
@@ -4,7 +4,8 @@
start = cv2.getTickCount()
# 读入一张图片
-img = cv2.imread('lena.jpg')
+# You should use Flag here so that it will read colored or grey
+img = cv2.imread('lena.jpg', 0)
# 停止计时
end = cv2.getTickCount()
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