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you print out the thresholded image, not the retval ;)

btw [255 0 0] would be blue, not red (BGR order in numpy/opencv)

and as always: read docs !

you print out the thresholded image, not the retval threshold value, which is in retval ;)

btw [255 0 0] would be blue, not red (BGR order in numpy/opencv)

and as always: read docs !

you print out the thresholded image, not the threshold value, value, which is in retval ;)

btw [255 0 0] would be blue, not red (BGR order in numpy/opencv)

and as always: read docs !