Sobel and Laplace results appear in grayscale
I have been trying to follow the tutorial on image gradients found on this link https://docs.opencv.org/3.0-beta/doc/py_tutorials/py_imgproc/py_gradients/py_gradients.html
The results for Laplacian, Sobel x, and Sobel y appear in black and white according to the tutorial. But my results appear in gray.
I cannot seem to find the reason since I am using the exact same code and the same sample image.
Solution
Very late, but if someone encounters the same problem, my guess is you forgot to take the absolute value of your results (so the 0 values appear in gray because they are the center between the negative and positive peaks)
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