python - How to convert an image from np.uint16 to np.uint8?

Question

I am creating an image so:

image = np.empty(shape=(height, width, 1), dtype = np.uint16)

After that I convert the image to BGR model:

image = cv2.cvtColor(image, cv2.COLOR_GRAY2BGR)

I'd like to convert the image now in a dtype = np.uint8 in order to use that image with cv2.threshold() function. I meant, I would like to convert the image to CV_8UC1.

Answer 1

You can use cv2.convertScaleAbs for this problem. See the Documentation.

Check out the command terminal demo below :

>>> img = np.empty((100,100,1),dtype = np.uint16)
>>> image = cv2.cvtColor(img,cv2.COLOR_GRAY2BGR)

>>> cvuint8 = cv2.convertScaleAbs(image)

>>> cvuint8.dtype
dtype('uint8')

Hope it helps!!!