how do i convert image into gray scale using python?

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'

Probably in the last line you should replace colorIm by img, but neither your identifiers nor the lack of comments help, You may want to re-read the minimum example explanation here. — guidot
– guidot, Commented Mar 10, 2020 at 10:16

Sebastian Dziadzio · Accepted Answer · 2020-03-10 10:13:50Z

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]

answered Mar 10, 2020 at 10:13

Sebastian Dziadzio

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2 Comments

Faheem Ur Rehman Over a year ago

thanks for your ans. how do i convert that all images into numpy array?

Sebastian Dziadzio Over a year ago

If you want a list of numpy arrays, you can do greyIm = [np.array(img) for img in greyIm]. If you want all of them in a one array of shape (5, height, width), you can then do greyIm = np.stack(greyIm).

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