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look at this:

/// Using Canny's output as a mask, we display our result dst = Scalar::all(0);

src.copyTo( dst, detected_edges);

look at this:

/// Using Canny's output as a mask, we display our result
 dst = Scalar::all(0);
Scalar::all(0);
src.copyTo( dst, detected_edges);

look at this:

/// Using Canny's output as a mask, we display our result
dst = Scalar::all(0);

src.copyTo( dst, detected_edges);

so, the "color" is only a result of the visualization.

look at this:

/// Using Canny's output as a mask, we display our result
dst = Scalar::all(0);

src.copyTo( dst, detected_edges);

so, the "color" is only a result of the visualization.visualization. if you want the "raw" Canny output, just display that instead:

imshow("canny",  detected_edges);

look at this:

/// Using Canny's output as a mask, we display our result
dst = Scalar::all(0);

src.copyTo( dst, detected_edges);

so, the "color" is only a result of the visualization. if you want the "raw" Canny output, just display that instead:

imshow("canny",  detected_edges);

look at this:

/// Using Canny's output as a mask, we display our result
dst = Scalar::all(0);

src.copyTo( dst, detected_edges);
imshow( window_name, dst );

so, the "color" is only a result of the visualization. if you want the "raw" Canny output, just display that instead:

imshow("canny",  detected_edges);