diff --git a/app/src/main/cpp/PhoneDevice.cpp b/app/src/main/cpp/PhoneDevice.cpp
index 0d3403eb..39b3c65d 100644
--- a/app/src/main/cpp/PhoneDevice.cpp
+++ b/app/src/main/cpp/PhoneDevice.cpp
@@ -1574,7 +1574,7 @@ bool CPhoneDevice::OnImageReady(cv::Mat& mat)
     cv::Point rb(0 + textSize.width, lt2.y + textSize.height + 8 * ratio);
 
     cv::Mat roi = mat(cv::Rect(lt2, rb));
-    cv::Mat clrMat(roi.size(), CV_8UC3, cv::Scalar(255, 255, 255));
+    cv::Mat clrMat(roi.size(), CV_8UC3, cv::Scalar(0, 255, 255));
     double alpha = 0.2;
     cv::addWeighted(clrMat, alpha, roi, 1.0 - alpha, 0.0, roi);