CODEWITHSUNDEEP
pythonnumpyopencv
Yatin Kumar
Yatin Kumar

Reputation: 33

confusion in numpy datatypes

the below program splits an rgb image into separate color channels

import cv2
import numpy as np
img = cv2.imread('dog_backpack.jpg')
cv2.imshow('RGB COLOR',img)
cv2.waitKey(0)
B,G,R = cv2.split(img)
zero = np.zeros(img.shape[0:2],dtype="uint8")
cv2.imshow('RED',cv2.merge([zero,zero,R]))
cv2.waitKey(0)
cv2.imshow('GREEN',cv2.merge([zero,G,zero]))
cv2.waitKey(0)
cv2.imshow('BLUE',cv2.merge([B,zero,zero]))
cv2.waitKey(0)
cv2.destroyAllWindows()

on line 7 when i use np.zeros function with any int data type it throws an error but when i use it with uint8 it run properly. please explain

Upvotes: 3

Views: 42

Answers (1)

Berriel
Berriel

Reputation: 13641

By default, cv2.imread will load the image using np.uint8, unless you change the flag.

You can also write like this:

np.zeros(img.shape[:2], dtype=img.dtype)

Upvotes: 1

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