I have read many articles like [this](http://docs.opencv.org/master/d7/d4d/tutorial_py_thresholding.html) which suggest that you can only apply a threshold to a grayscale picture.
I have also seen splitting of RGB or HSV values to apply a threshold to the individual channels. However, is it possible to apply a threshold to an image, to all of these channels, without the need for a time expensive split/merge operation?
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