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Combine a color Image to Gray image

Dear everyone, Mat Gray; //gray scale Mat drawing = Mat::zeros(imgThresholded.size(), CV_8UC3); //color

on drawing image, I gonna draw some lines, points, I want to merge them to the Gray, and display the Gray image. Could you please help. Thank you!

Combine a color Image to Gray image

Dear everyone, everyone,

Mat Gray; //gray scale
Mat drawing = Mat::zeros(imgThresholded.size(), CV_8UC3); //color

//color

on drawing image, I gonna draw some lines, points, I want to merge them to the Gray, and display the Gray image. Could you please help. Thank you!