OpenCV: convert Scalar to different color space

Question

I am using a Scalar to define the color of a rectangle I am drawing with OpenCV:

rectangle(imgOriginal, Point(0, 0), Point(25, 50),         


        

Answer 1

Use this to convert a single value:

cv::Vec3f rgb;
cv::Vec3f hsv;
hsv[0] = H;
hsv[1] = S;
hsv[2] = V;
cvtColor(hsv, rgb, CV_HSV2BGR);

Then you can use it:

rectangle(imgOriginal, Point(0, 0), Point(25, 50), 
    Scalar(rgb[0], rgb[1], rgb[2]), CV_FILLED);