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Hi, check the type of your image (CurrentMat). If it is a single channel image, the rectangle will be drawn in gray. Then you can use cv::cvtColor() function to convert the image into a RGB image.

cv::cvtColor(CurrentMat, CurrentMat_RGB, CV_GRAY2RGB);

Hi, check the type of your image (CurrentMat). If it is a single channel image, the rectangle will be drawn in gray. Then you can use cv::cvtColor() function to convert the image into a RGB image and draw the rectangle in this image.

cv::Mat CurrentMat_RGB;
cv::cvtColor(CurrentMat, CurrentMat_RGB, CV_GRAY2RGB);
CV_GRAY2RGB);
rectangle( CurrentMat_RGB, matchLoc, Point( matchLoc.x + TemplateMat.cols , matchLoc.y + TemplateMat.rows ), Scalar(0,0,255), 2, 8, 0);