我如何使用python将图像转换为灰度？

Question

I have 5 images in folder. I want to convert all that images into grey scale.

import glob
colorIm = []
for filename in glob.glob('/content/drive/My Drive/Colab Notebooks/Asplab/Cifar/*.png'):
  print(filename)
  img = Image.open(filename)
  colorIm.append(img)
  greyIm=colorIm.convert('L')

AttributeError: 'list' object has no attribute 'convert'

Answer 1

You need to convert each image in the list:

import glob

colorIm = []
for filename in glob.glob('/content/drive/My Drive/Colab Notebooks/Asplab/Cifar/*.png'):
  print(filename)
  img = Image.open(filename)
  colorIm.append(img)

greyIm = [img.convert('L') for img in colorIm]