Removing alpha channels from grayscale images

Question

I have some B&W images, but in RGBa. I used skimage rgb2gray(inp_image) to convert them into grayscale. Yet they become grayscale images with alpha channel.

What do I do if I want to have those RGBa converted to grayscale without alpha channel?

Answer 1

You can try out this.

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()

for multiple images

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))