从灰度图像中删除 alpha 通道

Question

我有一些黑白图像，但是是 RGBa。我使用 skimage rgb2gray(inp_image) 将它们转换为灰度。然而它们变成了带有 alpha 通道的灰度图像。

如果我想把那些RGBa转成没有alpha通道的灰度怎么办？

Answer 1

你可以试试这个。

import cv2
  
image = cv2.imread('path to your image')
gray = cv2.cvtColor(image, cv2.COLOR_BGR2GRAY)
  
cv2.imshow('Gray image', gray)
  
cv2.waitKey(0)
cv2.destroyAllWindows()

多张图片

import cv2
from os import listdir,makedirs
from os.path import isfile,join

source = r'path to source folder'
destination = r'path where you want to save'

files = [f for f in listdir(source) if isfile(join(source,f))] 

for image in files:
    try:
        img = cv2.imread(os.path.join(source,image))
        gray = cv2.cvtColor(img,cv2.COLOR_BGR2GRAY)
        dstPath = join(destination,image)
        cv2.imwrite(destination,gray)
    except:
        print ("{} is not converted".format(image))

从灰度图像中删除 alpha 通道

Removing alpha channels from grayscale images

python

image-processing

grayscale

scikit-image

cv2