[SOLVED] putText - result is always black text [closed]
 
  
 
  
 
 
 
 
 
 asked Jun 7 '16 
 
 pmh4514 gravatar image  
 
 
 
 updated Jun 9 '16 
 
 
 
 
 
Hello,
 
I have a Matrix of type CV_16UC1 which holds 16bit grayscale pixel data from an external camera.
 
I want to use putText to draw WHITE text over the image. 
 
But regardless which of the following two lines I try, the text is displayed, but it is always black.
 
What am I doing wrong?
 
cv::putText(target_mat, strStatus, Point2f(50,100), FONT_HERSHEY_PLAIN, 3, cv::Scalar(255,255,255),2);
cv::putText(target_mat, strStatus, Point2f(50,100), FONT_HERSHEY_PLAIN, 3, cv::Scalar(0,0,0),2);
 
Thanks!
 
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Closed for the following reason
      the question is answered, right answer was accepted by
      sturkmen 

      close date 2017-09-26 07:29:56.633461
 
 
Comments
If you have an image of just one channel (C1), you just need cv::Scalar(255)
LorenaGdL gravatar imageLorenaGdL (Jun 7 '16)edit
Thank you for your kind reply.
cv::Scalar(255) and cv::Scalar(0) still both produce only black text.
pmh4514 gravatar imagepmh4514 (Jun 7 '16)edit
1
0xff is white for a 8bit image, 0xffff is white for 16bit
berak gravatar imageberak (Jun 8 '16)edit
Thank you. using 0xffff instead of cv::scalar(255) solved the problem.
pmh4514 gravatar imagepmh4514 (Jun 9 '16)edit
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