[英]opencv: how to convert all black pixels to transparent and save it to png file
[英]How to convert a range of gray pixels to black with opencv?
import cv2
import numpy as np I = cv2.imread('imgPath')
## If you are interested in thresholding based on brightness,
## using grey channel or brightness channel from HSV is always a good idea :)
# Convert input RGB to HSV
HSV = cv2.cvtColor(I, cv2.COLOR_BGR2HSV)
# Get brightness channel
V = HSV[:, :, 2]
# Threshold all the very bright pixels
bw = 255*np.uint8(V < 200)
# save the image you want
cv2.imwrite("bw.png", bw)
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