c++ - Is there a quicker way to apply brightness in OpenCV? -


in application have following code changes brightness of pixel 20.

    for( int y = 0; y < src.rows; y++ )     {          for( int x = 0; x < src.cols; x++ )         {              for( int c = 0; c < 3; c++ )             {                 src.at<cv::vec3b>(y,x)[c] = cv::saturate_cast<uchar>( ( src.at<cv::vec3b>(y,x)[c] ) + 20 );             }         }     }

is there more efficient way of applying effect?

i not understand why cannot/do not use:

src = src + cv::scalar(20,20,20);

would not job?


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